Heat and Parking Sensors

[Phil303]

Over the last few weeks of hot weather the rear parking sensors have been playing up - the sensors only work about 20% of the time.

Now it's started to cool down the sensors seem to be behaving themselves.

The car often sits unused for a few days parked by the side of the house with the rear of the car facing directly south (and getting the full glare of the sun).

Could the heat be the source of the problem or is it coincidental?