Plays well for sometime then looses connection & sound!

It all started with a summer day ride, worked continuously for almost 6 hours. Parked my bike in direct sun & when started to ride again no connection or sound error was noticed. Now it works well for almost 15-20 mins on loud volume & then looses connection. Static noise & vibration is noticed from midrange drivers on side. Looks like some component onboard overheats & creates this problem.

Please assist.