Sudden Power Drain on my Diamond

[Biker1]

I notice that sometimes my battery drains totally overnight. It goes from 90%+ to 15%. Maybe Casper is using my Diamond at night
I have data connectivity set to 1x and I did the battery polling tweak registry change.
This only ocurrs once in awhile. I can't figure it out.
I switch between 2 batteries, and both are only 8 months old. So they each have approx. 4 months of use.
I notice this happens during the day sometimes also. This occurred when I had data connectivity set to EV. I don't know if the draining was due to the EV setting, or it was a coincidence.
I do notice that the Diamond awakes by itself sometimes. When I'm sleeping, I don't know how often it does that.I will keep an eye on this, to see exactly how often this issue is ocurring.
It has happened a few times and I didn't think anything of it until now.
Any ideas?