Just yesterday my printer started giving me this error every time I attempt a print. It will go for awhile (5-10 layers) and then pop up ending the print. I just monitored it and it looks like the commanded temp of 55 is dropping to 51.4 or so and then giving the error. Are there any common things to look at? I replaced the flat cable clamp with the one from Thingiverse and covered my bed heater with aluminum tape to eliminate it catching on the crap under the bed when it sagged several months ago. Nothing has changed recently. I also have replaced the tiny little fan under the RAMPS board with a 120 mm thin fan so it shouldn't be a cooling issue. The printer is only about 6-7 months old. Right now I am heating the bed to 55 and watching to see if it does it just sitting still. Any help would be appreciated. Also I was thinking about enabling PID for the bed but the instructions I found say to enable PIDTEMPBED and BED_LIMIT_SWITCHING but when I try to compile I get an error about not being able to enable both of those. In reading further I'm not even sure I should enable bed PID with the stock heater, should I?