Hi, a couple of days every half an hour or so, and sometimes 5 minutes after the start of printing throws an error Error 12 E. Perzagruzite the printer and continue again thermal runaw ... then break the phrase. That it's overheating. The usual print goes PETG 235 nozzle and 80 table. Well, there are fluctuations at the table in 1 degree, but I think it is not critical probably. And I didn't remove the case fan and didn't stop it in any way. Where might the problem be?