2015 Fusion Blindspot Sensor

[Tel864]

The blindspot sensor on my 2015 Fusion sensor starts acting up when the temperature gets above 80 degrees or so. When it heats up, the light will remain on, sometimes for an extended time and sometimes until I disable it. It seems to be mostly on the drivers side and more often when there is a line of cars passing on the left. I've taken it to the dealer and as I expected they can't duplicate the problem. They've test driven it twice and ran diagnostics without finding the problem. I get no faults showing on the dash although I don't know if there is a fault light for that. 

Does anyone have anything I can point the dealer at to isolate the problem? I'd like to get this fixed while still under warranty.

    This is the same dealer that kept my car for over 3 weeks while doing a nationwide search for replacement fuel injectors they said was causing my car to miss only to find out afterwards that it was some type of bad computer test module. Needless to say I'm not hopeful.

Thanks

[eGuru]

Can you narrow the symptoms down?

Is it mostly on the driver's side or only on the driver's side?

[Tel864]

Sorry, for this very late reply but other things came up and it turned cold, along with my computer crashing and making me lose my web links.. It happens mostly on the drivers side but I seem to remember it happening a few times on the passenger side. I would say it's 99% on the drivers side. I actually took it back to the dealer but the temperatures were starting to drop and of course it wouldn't repeat itself. The dealer kept it for two days and after test driving it and running diagnostics they couldn't find a thing. I was told that if there was a problem with it, I would get a notification on my dash. I guess I'll now wait until summer and take it in again since it's working perfectly now in cold weather.