Last Friday I started a long ~50 hour print.
Extruder 1: polymaker polydissolve
Extruder 2: polymaker pla
Printer: Beta KT 7
About an hour into the print, I had a false positive runout error for extruder 2, but it resumed fine and ran normally. At 38 hours, 44 min it had a true runout error for extruder 1. I removed, cut, and replaced the polydissolve and confirmed it was extruding. I was also running low on the PLA, so I wanted to replace it with a full reel. I selected extruder 2 and set it to heat back up; however, the temp kept going down, and after a minute or so I got the error: E2 HEATING FAILED, PINTER HAULTED, Please Reset.
Yesterday I tried to print a shorter 13 hour model with the same filament setup. At 1 hour 55min, it had a false positive runout. This occurred after I left, so I didn't resume it until this morning. It heated back up resumed printing. At 3hr21min and 4hr35min it had false positive runout failures for extruder 2; both times the print was able to resume printing. Jeff suggested to turn off the runout sensor, but I wanted to keep logging the errors. At 4hr52min, it had a true positive runout error for extruder 1. I confirmed it was stripping, but also it was losing heat. I set the temp to 200C for one, then both nozzles, but neither were heating back up and after a min got the same error "E1 Heating Failed, Printer Haulted, Please Reset."
If no one else is running into these runout and heating failures it may be my machine, and it needs to be addressed before I continue printing.