Issues with audio recording

Hello,
This month I just received Zynthian v4 and I am really impressed with performance improvement comparing it to my custom headless build on Rpi 3 b :smiley:
There were some issues which are probably fixed in Staging-2104, I need to check this later.
But there is one more thing that is probably broken in both:
In all my audio recordings on USB flash drive that are longer than 30 seconds, after about that time audio is distorted till the end of recording. Sometimes recording is also called #NO-jack_capture.wav instead of selected layer. This happens both for Synth Engines and Audio FX layers recording.
I haven’t noticed anything problematic during recording, as sound from audio outputs (and Rpi headphone outputs) was fine all the time. I discovered this during recording playback on Zynthian and my phone.
Some thing that may be related:

  1. Recording is not available instantly after I click “stop recording”, and time indicator stucks on 0:00 for even few minutes. Is it normal? Is there some postprocessing going on then?
  2. On first boot of Zynthian stable image red “Error” appears on boot splash. On later boots starting screen is fine.

How can I investigatet this more: is there any way to enable writing logs on USB by default, as I do not want to flood my sdcard with them?

Maybe this is problem with my hardware? Or flash memory? Has somebody tried recording audio fx layers, and haven’t got any problems?

If your recording is long (>10/20 minutes), or your USB is slow, then it’s completely normal.

This is normal too. On first boot, error screen is generated and displayed for a while.

This is not normal. Could you send some recording with this problem?

Thanks

All test recording were shorter than 3 minutes. They are being processed each time about 1 to few minutes on USB and few seconds on SD.
Recordings saved on sd-card are fine.

Example recorded from external source (digital piano) https://drive.google.com/file/d/1Q9_Co542msuswwvgCMKqnuQ4DoQyzyOM

I tested two different USB3 flash drives with the same results.

One additional line in log, that I have found:
May 06 11:57:52 zynthian startx[5612]: Terminal type unknown’ is not defined. `