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CrashReport was empty. No more ideas... Then I took a microscope and examined the PCB. I seem to have found a problem. Due to the very narrow spaces between tiny tracks and microscopic Cu dust left after etching in some places, the resistance between tracks was too small. So after cleaning, the...

Thanks a lot!. This is exactly what I missed - crash report. Did not think few lines of a scetch could help as symptoms are quite clear and hoped someone had that before. I'll get back!

Hey:) Stuck with troubleshooting, so appreciate your comments! Simpliest setup: Teensy 4.0 +ST7735S + encoder with push button, All is OK and the system runs flawlessly until the encoder or push button is actively engaged, i.e., "while" cycles (such as digitalread(PushBtnPin)==HIGH/LOW) in the...