2008 Volvo C70

Need help; While driving in the rain in Florida, AC in auto blowing cold air, hot air starts blowing. Cannot shut off blower (now on high), blowing very hot air. Radio control knobs stop working. In fact entire center control panel ceases to work. Shut the car off for 15 minutes and everything works fine. After the first time, car ran fine fine for 90 days before it did it a second time. Mechanic could not duplicate and reloaded software. May not know if car is fixed for months? Any ideas?

Check all your battery and ground connections are good and clean. There is a plastic shield that supposed to keep water out of the engine bay and away from the alternator. Is this shield missing? If it is you need to put it back and it will solve your problem.