As usual, my N810 charged during the night and I took it in the morning; it was fully charged. But after about 5 hours, when I took my N810 out of my pocket, it was quite hot and the battery was almost empty! This is surprising as I didn't have any problem the previous days. The CPU indicator was saying the N810 was idle. I only had two open applications:

• X Terminal (with no running jobs in it). This is not the first time (I use X Terminal very often). So, I doubt this is the problem.
• Notes (perhaps the first time I let it open under diablo).

Also, no wifi, no bluetooth. Any idea? Could there be a problem with some software taking CPU time only when the tablet is locked?