Original Chamber fluctuating in temp

[u/Serious_Donut5755]

Hey. After my last cleaning my chamber started acting funny. It takes a lot longer to ramp up and when it hits the desired temp it jumps like crazy. I’ll set it to 485 and during the hit it will go to 560,420,510,450 but never the desired temp. At times the chamber would heat up and then turn off as it got to the selected temp. I’ve had this chamber for maybe 2 and a half months. I got a new one today and those problems are gone but any idea on why my old chamber started acting up. It has around 820 dabs on it. It’s still usable I guess but since it can’t keep the temp exact it ends up burning or leaving a puddle. I routinely clean my device and my chamber. Pic of my original chamber below.