Haven't seem this topic discussed lately and I have been experiencing it quite frequently over the last month or so on my 2008 4.8 with Comfort Access. 140K miles.

In November I replaced the battery. About two weeks later I replaced the alternator. (left me sitting middle of nowhere / middle of the night)

Some time last month I started getting the High Drain notice. It goes off after driving the car for 30-45 minutes. I have all ideas that it is connected to the Comfort Access system but wanted to know if anyone else has experienced this also. The car will lock itself at random intervals when I walk by it with the key in my pocket. Doesn't unlock, just locks. The drivers door exterior handle doesn't work as well as it should with the Comfort Access function.

Thoughts?