I mean by saying "my sensor movement got worse" as realtemp says below a sensor movement of 3 is indicator the sensor is stuck. And both mine have gone from 7 and 9 to 0 and 0. Thats what i mean by theve gotten worse.
I'm no expert, but if your operating temperatures are changing quite often it could mess with the sensor. If the room temp is going from ~50F to ~100F when you turn it on that cycle over and over again could damage it, there's not much to say or do about it unless you want to RMA it, but on grounds of a stuck sensor that could be hard.
Also all that RealTemp says is that it is no longer capable of providing accurate idle temperatures, which isn't a big deal, load is what should concern you when testing and such.