included SD card is Unreliable

more details to come.

Traceback (most recent call last):
  File "<stdin>", line 160, in <module>
  File "/flash/sys/st3m/run.py", line 131, in run_view
  File "/flash/sys/st3m/reactor.py", line 113, in run
  File "/flash/sys/st3m/reactor.py", line 119, in _run_once
  File "/flash/sys/st3m/reactor.py", line 144, in _run_top
  File "/flash/sys/st3m/processors.py", line 77, in think
  File "/flash/sys/st3m/ui/elements/overlays.py", line 83, in think
  File "/flash/sys/st3m/ui/view.py", line 179, in think
  File "<stdin>", line 152, in think
  File "<stdin>", line 120, in download_file
OSError: [Errno 5] EIO

E (6500) sdmmc_req: handle_idle_state_events unhandled: 00001000 00000000
E (6500) sdmmc_req: handle_idle_state_events unhandled: 00001000 00000000
E (10510) sdmmc_periph: sdmmc_host_clock_update_command(200): sdmmc_host_start_command returned 0x107
E (10510) sdmmc_common: sdmmc_init_ocr: send_op_cond (1) returned 0x107
E (10510) st3m-fs-sd: SD Card initialization failed: ESP_ERR_TIMEOUT
E (10520) sdmmc_req: handle_idle_state_events unhandled: 00001000 00000000
E (11520) diskio_sdmmc: Check status failed (0x107)
E (11520) st3m-fs-sd: Registering FAT SD partition failed: ESP_FAIL

replacing SD card works (used a 64G sandisk ultra, class 10, U1).

formatting included SD card does not help.