If the fans come on and then go off some time later, then they are cooling, so all is ok, apart from a temp gauge that you don't like even though it is in the "norm" range.
The gauge is VERY sensitive once up to temp, and even just a few degrees makes a big big difference on gauge.
Mine runs on the top of the "O" mostly but have a fan light in top corner of tacho, a blue led that comes on with fans, they come on at 95C and go off at 92C never misses a beat, you're worrying unduly.
tabetha