Rear Trunk Randomly Opening

[DMage]

Thought I was going crazy on this one. 2000 Boxster S with manual release front/rear trunks and electric release rear on key fob.

After picking up the car and on the six hour drive home I kept getting out to an open trunk. I thought - you must keep pushing the trunk button when you start the car. The key fob at that time was completely worn and I couldn't tell what was what with the car being new to me.

Well, replaced the key fob bits and have been more careful. But, nope still happening. Now I am thinking I am an idiot, and starting the other day decided I would begin a routine of starting the car, checking the trunk lid, getting to the destination, checking the trunk lid, and turning off the car.

However, had a friend come in and wasn't really thinking about it. Took him for a drive, we did two quick drive errands and no lid popping. Then took the car on a spirited drive and after 45 mins got home to a popped trunk. Was out of the car with it still running as we juggled cars in the driveway and chatting with him - closed the trunk and as we are standing back there it reopens on its own. Key still in the ignition.

I am assuming now that either the solenoid is going and when it gets hot back there its triggering, or there is a heat related short that is occurring. Was going to pull the trunk apart today and try to disconnect the solenoid. Anyone else have this issue or heard of this before? I haven't found much from searching around. Only other thing I can think is its the latch mechanism itself that is impacted by the heat - or - the trunk needs some sort of adjustment.

Thanks!