The touchscreen randomly stops working between reboots

[tgzp]

System: Rpi CM4 + freshly installed RPI OS Lite (bookworm) + latest FLY-TFT driver
Screen: FLY-TFT V2 Capacitive

The display randomly stops working. Sometimes it displays everything fine and the touch function works properly, sometimes the touch function doesn't work, then sometimes it shows a blank white screen, as if the driver is not installed.
I reinstalled the driver several times, checked and reconnected the FPC cable, but the errors remained the same.

Below are some dmesg records paired with different error symptoms:

1. Touch OK
   
2. The touch function works, but you have to press the right edge of the display for the left to react.
   
3. Touch funcion does not work.
   
4. Touch OK, but there are several error messages.
   
   

[kluoyun]

When using RPI, you need to turn the switch to Resi (regardless of whether the screen is capacitive or resistive).
If a white screen appears, you need to check your system, or you can try the system mirror test we provide.

[tgzp]

The display previously worked well for weeks with Cap switch position. The documentation does not mention anywhere that you have to set the switch to Resi position with Raspberry.
I just changed the switch to resistive, but the touch function doesn't work either.

[kluoyun]

The display previously worked well for weeks with Cap switch position. The documentation does not mention anywhere that you have to set the switch to Resi position with Raspberry. I just changed the switch to resistive, but the touch function doesn't work either.

Try using this. download-link-for-pre-installed-tftv2-system-for-raspberry-pi

[tgzp]

Thanks, but I will not use any operating systems from unknown sources. I'm only asking for help on how to get the display working properly with the official RPI OS.

[kluoyun]

You can use the latest non-Lite system and reinstall the TFT driver. We just want to confirm whether it is a software or hardware problem. It does not necessarily require you to use the so-called "unknown source" operating system.

[tgzp]

So I have a spare RPi Zero 2. I installed the latest RPI OS (Desktop) on it. Then I installed the FLY-TFT display driver.
After restarting the system, the display and touch function also worked, but after a few seconds, the touch stopped responding.

Second restart: touch OK. I tested it for a few minutes.

Third restart: It does not respond to any touch

[aftansin]

the same problem! the same errors!

[tgzp]

@kluoyun Hello! Any update on this? Or should I open a warranty claim? There's been a problem with the display from day one, and I reported it after purchase.