I personally think its either a probe issue of it fell off the tape or its a T-stat issue. All heat tapes will have some variation in temp at spots. Its the nature of heat tapes but no heat tape is going to have a variation from 89F to 130F lol. More like a few degrees here and there. Have you physically felt the heat tape to see if it is that hot? I mean you will know the feel of 130F by hand lol. And like others said, try a different t-stat to see if it fixes it. While I agree Jump Start t-stats aren't high end, I have one that has been going for about 2 years now with no problems. Of course I also have 4 Herpstats which are my real workhorses.