This may be a random event, but here is what happened:
1) Switch on camera and and take couple of pictures
2) While camera still on in taking pictures mode, switch off the phone (by the switch on top).
After doing that, about 1.5 hour later I took out the phone to check the emails. Phone was very warm - not the kind of unpleasantly hot you get from Macbook Pro battery when rendering movie on batery power , but still much warmer than ever. Camera was still on. The battery that was two hours ago fully charged was on less than 10%. Strange.
Anybody else had similar experience ?
Since that, of course I am careful to switch off the camera first. I think that time is almost ready for 2.1 firmware with the core apps updates, how about that Apple ?