For the past two months or so, my Bullet has been very stable on the latest beta firmware. Doing multiple 1KG back to back roasts has also not been any issues at all. Yesterday, after doing a 1KG roast, during my second preheat, there was a beep (no errors displayed), P dropped to 0 and preheating stopped. I had to press the PRS button to cycle to roasting, cooling, shutdown and back to preheat to get going again. The ambient temperature was about 15C when I was roasting and the PCB and IR ambient was about 50-55C.
I have had the beeps occasionally without the preheat actually stopping. There were no errors, no logs, so, couldn’t figure out what was up. It was like the roaster just gave up and decided to take a break.