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Sudden but gradually loss of power and white smoke is the only sign of head gasket leak that enable coolant and engine oil to mix together in one of the cylinder head. When coolant gets heated with engine oil, it start burning and result in white power loss and white smoke. In some cars head gasket leak has a check engine light on and in some case doesn't if car ECU system has no time to detect any unusual behavior. Ask your mechanic to do the manual compression test and get the pressure reading of all cylinder that will tell more what's going on inside and why car stalled like this......?

I dont think it's a battery issue because to run an audio system battery requirement is very less unlike cranking the car or run the interior lights and headlights. It seems some fuse or electric relay is acting funny so find out which all fuse and relay is required for audio system and swap them with neighboring same AMP fuse.

Best bet is to check any blown out fuses in fuse panel first and then inspect any loose cabling behind the in-dash unit. Also worth checking if its only happening in night or also in daytime, if in night only then it might be cause of battery as when headlight is on battery is not strong enough to power up the audio system.

I had something very similar issue few years back and it turned out to be the Engine fan was the culprit. Engine fan works with viscose clutch and that usually rotate at half rpm speed of engine but when engine gets hot then viscose clutch get fully engage and rotate at 100% speed of engine RPM. This help drawing bigger amount of air and pushes through radiator to cool the coolant at a faster rate. The amount of air and pressure it uses is far above any electric fan and it is capable to dissipate heat within seconds. Engine fan usually have a life of 5-10 years depending on usage, and it's slightly expensive to replace somewhere in range of 800-1200 AED. Go again and test your car in desert and pay extra attention this time when car overheat, that engine fan started working at higher rpm? As it's mechanical operation, so there is no proven and clear way to see when it works except you need to listen that result in LOUD GUSHING NOISE from engine bay. If your car still be quite when engine is slightly overheating then its confirmed that this engine fan viscose clutch needs replacement. If this fan produced enormous gushing noise and temperature drops and then this noise goes back to normal noise level, then that means this engine fan is working and there is something else to doubt.