Zilla Temperature Controller Malfunction?

Hi everybody!
I have been really frustrated with my temperature controller from Zilla. It has been working fine until about three weeks ago. Now, the temperatures are fluctuating radically (from about 83 F to 97 F.) I checked to see if the probe was securely attached to my UTT heat pad and it was. Does anybody out there know of a more reliable temperature controller for UTT heat pads? I am very concerned about my snake's health so the sooner I get a recommendation, the better.
Thank you all!

Ooohh! I have one of those on my UTH. Thanks for the heads up. I will keep a close eye on it.
How long have you had it?

For about three months.
I did a little research last night and found one called Hydrofarm Digital Temperature Controller for heat mats on amazon. I am going to give that a try.
If anybody out there has any feedback on the Hydrofarm, please let me know.

I'm surprised that happened with the zilla I know a couple ppl who use them on their racks. As for the hydrofarm, I don't have any experience with then but I know that a lot of ppl do use them and have nothing but good things to say. Good luck

Thank you! I am hoping I get better luck with the Hydrofarm. I am thinking that since the probe also reads the temperature, I will get a more accurate reading. We'll see.