Nozzle not reaching Temp

I have a taz 6 and I’m printing with PETG and trying to get the nozzle temp to 235c.
I’m using the V3.1 duel extruder and only printing with the back extruder.
The nozzle will only go up to 230c then bounce back and forth between 227 and 230 till it faults out and asked to be reset. What I don’t understand is that, I paused the print, went into tune, turned up the nozzle to 240c and it went up to temp with no problem. I press resume and again it goes back down below 230c. Do you know whats causing this or have any suggestions?
Thanks for the help!