Severe IO errors when under load

I've been experiencing severe errors when my Jolla is under load today (watching videos, e.g. Android iplayer, but also in the native browser). These appear similar to the storage full errors, but my phone is only a few days old, and is most certainly not full. The application starts stuttering, eventually freezes, then the display dies and the red flashing notification LED begins its merry little show. I have to pull the battery to get things working again. #btrfs fi df / Data, single: total=6.08GiB, used=3.58GiB System, DUP: total=8.00MiB, used=4.00KiB System, single: total=4.00MiB, used=0.00 Metadata, DUP: total=330.00MiB, used=70.78MiB Metadata, single: total=8.00MiB, used=0.00 #df -h Filesystem Size Used Avail Use% Mounted on rootfs 14G 3.8G 9.6G 29% / /dev/mmcblk0p28 14G 3.8G 9.6G 29% / devtmpfs 404M 64K 404M 1% /dev tmpfs 405M 316K 405M 1% /dev/shm tmpfs 405M 16M 390M 4% /run tmpfs 405M 0 405M 0% /sys/fs/cgroup tmpfs 405M 4.0K 405M 1% /tmp /dev/mmcblk0p18 64M 45M 20M 70% /firmware /dev/mmcblk0p19 7.9M 4.1M 3.9M 52% /drm /dev/mmcblk0p25 7.9M 4.2M 3.8M 53% /persist /dev/mmcblk0p28 14G 3.8G 9.6G 29% /home /dev/mmcblk0p9 48M 7.2M 41M 16% /var/systemlog tmpfs 405M 0 405M 0% /mnt/asec tmpfs 405M 0 405M 0% /mnt/obb /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/bin /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/sbin /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/lib /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/usr /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/var /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/etc tmpfs 405M 4.0K 405M 1% /opt/alien/tmp /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/home /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/vendor /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/data devtmpfs 404M 64K 404M 1% /opt/alien/dev tmpfs 405M 316K 405M 1% /opt/alien/dev/shm tmpfs 405M 0 405M 0% /opt/alien/sys/fs/cgroup tmpfs 405M 16M 390M 4% /opt/alien/run /dev/mmcblk0p28 14G 3.8G 9.6G 29% /opt/alien/system_jolla /dev/fuse 14G 3.8G 9.6G 29% /opt/alien/home/nemo/android_storage /dev/fuse 14G 3.8G 9.6G 29% /home/nemo/android_storage So...here are the errors I'm getting: Mar 08 21:01:50 Jolla kernel: mmc0: Data CRC error Mar 08 21:01:50 Jolla kernel: msmsdcc_data_err: opcode 0x00000019 Mar 08 21:01:50 Jolla kernel: msmsdcc_data_err: blksz 512, blocks 24 Mar 08 21:01:50 Jolla kernel: slim reconfig done! Mar 08 21:01:50 Jolla kernel: sps:BAM 0x12402000 enabled: ver:0x5, number of pipes:6 Mar 08 21:01:50 Jolla kernel: mmcblk0: error -84 transferring data, sector 1467944, nr 24, cmd response 0x900, card status 0xd00 Mar 08 21:01:51 Jolla kernel: mmc0: CMD8: Data timeout. DAT0 => 1 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC PWR is ON Mar 08 21:01:51 Jolla kernel: mmc0: SDCC clks are ON, MCLK rate=400000 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC irq is enabled Mar 08 21:01:51 Jolla kernel: ===== SDCC-CORE: Register Dumps @phys_base=0x12400000, @virt_base=0xf00b8000 ===== Mar 08 21:01:51 Jolla kernel: Reg=0x00: 0x00000001, 0x01209d00, 0x00000000, 0x00001448 Mar 08 21:01:51 Jolla kernel: Reg=0x10: 0x00000008, 0x00000900, 0x41473247, 0x430b3925 Mar 08 21:01:51 Jolla kernel: Reg=0x20: 0xbe934126, 0x0001d8a8, 0x00000200, 0x0010200b Mar 08 21:01:51 Jolla kernel: Reg=0x30: 0x00000200, 0x000c0600, 0x00000000, 0x408001ff Mar 08 21:01:51 Jolla kernel: Reg=0x40: 0x00000000, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x50: 0x0000001a, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x60: 0x60026400, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: mmc0: MCI_TEST_INPUT = 0x000003fe Mar 08 21:01:51 Jolla kernel: ===== SDCC-DML: Register Dumps @phys_base=0x12400800, @virt_base=0xf00f4800 ===== Mar 08 21:01:51 Jolla kernel: Reg=0x00: 0x00000011, 0x00010000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x10: 0x00000000, 0x00001000, 0x00001000, 0x00020001 Mar 08 21:01:51 Jolla kernel: Reg=0x20: 0x02000200, 0x00000200, 0x00000200, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x30: 0x00000000, 0x00001000, 0x00000000, 0x00004989 Mar 08 21:01:51 Jolla kernel: mmc0: SPS mode: busy=1 Mar 08 21:01:51 Jolla kernel: mmc0: xfer_size=512, data_xfered=0, xfer_remain=512 Mar 08 21:01:51 Jolla kernel: mmc0: got_dataend=0, prog_enable=0, wait_for_auto_prog_done=0, got_auto_prog_done=0, req_tout_ms=10000 Mar 08 21:01:51 Jolla kernel: mmc0: PM: sdcc_suspended=0, pending_resume=0, sdcc_suspending=0 Mar 08 21:01:51 Jolla kernel: mmc0: RPM: runtime_status=0, usage_count=1, is_suspended=0, disable_depth=0, runtime_error=0, request_pending=0, request=0 Mar 08 21:01:51 Jolla kernel: mmc0: CMD8: Data timeout. DAT0 => 1 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC PWR is ON Mar 08 21:01:51 Jolla kernel: mmc0: SDCC clks are ON, MCLK rate=400000 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC irq is enabled Mar 08 21:01:51 Jolla kernel: ===== SDCC-CORE: Register Dumps @phys_base=0x12400000, @virt_base=0xf00b8000 ===== Mar 08 21:01:51 Jolla kernel: Reg=0x00: 0x00000001, 0x01209900, 0x00000000, 0x00001448 Mar 08 21:01:51 Jolla kernel: Reg=0x10: 0x00000008, 0x00000900, 0x41473247, 0x430b3925 Mar 08 21:01:51 Jolla kernel: Reg=0x20: 0xbe934126, 0x0001d8a8, 0x00000200, 0x0010200b Mar 08 21:01:51 Jolla kernel: Reg=0x30: 0x00000200, 0x000c0600, 0x00000000, 0x408001ff Mar 08 21:01:51 Jolla kernel: Reg=0x40: 0x00000000, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x50: 0x0000001a, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x60: 0x60026400, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: mmc0: MCI_TEST_INPUT = 0x000003fe Mar 08 21:01:51 Jolla kernel: ===== SDCC-DML: Register Dumps @phys_base=0x12400800, @virt_base=0xf00f4800 ===== Mar 08 21:01:51 Jolla kernel: Reg=0x00: 0x00000011, 0x00010000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x10: 0x00000000, 0x00001000, 0x00001000, 0x00020001 Mar 08 21:01:51 Jolla kernel: Reg=0x20: 0x02000200, 0x00000200, 0x00000200, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x30: 0x00000000, 0x00001000, 0x00000000, 0x00004989 Mar 08 21:01:51 Jolla kernel: mmc0: SPS mode: busy=1 Mar 08 21:01:51 Jolla kernel: mmc0: xfer_size=512, data_xfered=0, xfer_remain=512 Mar 08 21:01:51 Jolla kernel: mmc0: got_dataend=0, prog_enable=0, wait_for_auto_prog_done=0, got_auto_prog_done=0, req_tout_ms=10000 Mar 08 21:01:51 Jolla kernel: mmc0: PM: sdcc_suspended=0, pending_resume=0, sdcc_suspending=0 Mar 08 21:01:51 Jolla kernel: mmc0: RPM: runtime_status=0, usage_count=1, is_suspended=0, disable_depth=0, runtime_error=0, request_pending=0, request=0 Mar 08 21:01:51 Jolla kernel: sps:BAM 0x12402000 enabled: ver:0x5, number of pipes:6 Mar 08 21:01:51 Jolla kernel: end_request: I/O error, dev mmcblk0, sector 1467944 Mar 08 21:01:51 Jolla kernel: Write-error on swap-device (179:0:1467952) Mar 08 21:01:51 Jolla kernel: end_request: I/O error, dev mmcblk0, sector 1467952 Mar 08 21:01:51 Jolla kernel: Write-error on swap-device (179:0:1467960) Mar 08 21:01:51 Jolla kernel: end_request: I/O error, dev mmcblk0, sector 1467960 Mar 08 21:01:51 Jolla kernel: Write-error on swap-device (179:0:1467968) Mar 08 21:01:51 Jolla kernel: mmc0: CMD18: Data timeout. DAT0 => 1 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC PWR is ON Mar 08 21:01:51 Jolla kernel: mmc0: SDCC clks are ON, MCLK rate=400000 Mar 08 21:01:51 Jolla kernel: mmc0: SDCC irq is enabled Mar 08 21:01:51 Jolla kernel: ===== SDCC-CORE: Register Dumps @phys_base=0x12400000, @virt_base=0xf00b8000 ===== Mar 08 21:01:51 Jolla kernel: Reg=0x00: 0x00000001, 0x01209900, 0x001daf48, 0x00001452 Mar 08 21:01:51 Jolla kernel: Reg=0x10: 0x00000012, 0x00000900, 0x41473247, 0x430b3925 Mar 08 21:01:51 Jolla kernel: Reg=0x20: 0xbe934126, 0x0001d8a8, 0x00001000, 0x0010200b Mar 08 21:01:51 Jolla kernel: Reg=0x30: 0x00001000, 0x000c0600, 0x00000000, 0x408001ff Mar 08 21:01:51 Jolla kernel: Reg=0x40: 0x00000000, 0x00000000, 0x00000000, 0x00000000 Mar 08 21:01:51 Jolla kernel: Reg=0x50: 0x0000001a, 0x00000000, 0x00000000, 0x00000000