I assume a BIAB setup and if so where do you have your temperature probe? Just below the bag? I have mine in the middle sticking into the bag and keep ripping holes. Thinking about doing two, one at the top of the return on the recirculating pump at the lid for mashing and one down below the bag or in my case the false bottom for boiling/whirlpooling.
It is set right above the boilcoil. I use a steamer basket that I line with the bag. So it sits right above the probe and prevents the bag from catching it.