w14a

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...

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...