eh_bee_see

I am having an issue with my Ultimaker 2+ where the buildplate temperature registered by the Ultimaker doesn't match the actual temperature but I don't get any errors, just bad buildplate adhesion. When I heat up my buildplate it increases to the expected temperature and works for a little while, but after a few layers, the temperature reported on the printer keeps going up (it got up to 105C when I had it set at 65C). I stopped the print and checked the actual temperature by touching the buildplate and it was pretty much cold (no warmer than 30C at most). I heated up the buildplate manually to see what is going on and it does heat up, but once it hits its set point is seems to cool down while the temperature displayed on the screen keeps increasing. I checked all the connections for the buildplate temperature sensor and they are fine. Has anyone else had this problem or have any ideas for a fix?