Solar Intensity Widget Having Problems Displaying Solar Input

My Instinct Solar Tactical has been having problems with displaying the amount of sunlight it's been getting through its solar intensity widget. Putting the watch into diagnostics mode seems to show that this is not a hardware issue because the uV value keeps changing with reference to the amount of light it's been getting. What's interesting is that resetting the SOL sensor by holding down the GPS button seems to work and I'd immediately be able to see the amount of sun being absorbed by the panels but the problem reoccurs after going indoors and exposing the sun to sunlight again after 30-40 minutes. I don't want to have to keep resetting the SOL sensor from within the diagnostics mode. Does anyone know a fix to this or should I set up another exchange?