So when I first got my Herpstat 1 set up and running on the dimming proportional mode it would go around 50% to maintain the temperature I set then 0% if it exceeded it and that was fine for a few days. It would change based on the current temperature of the probe like it's supposed to do. Now I looked at it today and it is only going between 90-100% then to 0% after it hits the number as if it were running on/off. The second it goes under the temperature I set it is immediately at 90-100% instead of trying to match the temperature to the power like it previously did. I checked the settings and nothing has changed. The probe is attached directly to the 4 inch heat tape with aluminum tape. I also did a quick search online and didn't find anything useful. This doesn't seem normal since it didn't start off doing this. Is there something wrong with my Herpstat 1?