Yes, power is not problem.
Please note that this crashing problem popped up suddenly just like something corrupted somewhere.
Every code works if not using LovyanGFX. If trying, then instant crash.
I am suspecting that Arduino has corrupted something but it seems not to be the library source code and not the arduino itself There could be some sort of linking problem but again, why it popped up and why every older program also with LovyanGFX does crash if compiled and loaded.
So, som sort of cache or internal configuration problem might be reason.
Arduino is just spreading the configuration and ... evrything here and there, so cleaning manually everything so that it cannot find anything corrupted is pretty impossible, at least for me.