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IMHO the sun (very, very, very intense at that time of the year) was generating some nice IR interferences

No.

If the empeg was wired up correctly to the car's ignition wire, then after it drops out of standby mode and gone into full power-off mode, it's no longer using the IR sensor at all, and no amount of stray IR interference can wake it up.

The only thing that can wake the player up after it's fully powered off in the car is if the switch on the AC adapter jack is briefly triggered, thus making the player think that it has been plugged into the AC adapter. Again, it's all in the usual place. Give it a read.

Part of the reason the above problem causes battery drains or blown tweeters is this: AC Mode usually means the player wakes up at maximum volume.
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Tony Fabris