what interface are you using, llama.cpp? Deepseek can be prodded to think for a fairly long time.
I have a few questions about the filament. was it on a spool? made of what? had it been touched/used, stuff moved around it recently? Air blowing on it from a fan, window? What type, PLA, abs, PETG, ULTEM (hehe)...
does other weird things happen? do you get zapped a lot when you get up or touch things, other living things?
static electricity can create a force-field...