here's stating the obvious you device isn't ever coming to rest. tbh if it was my device i'd be flashing it again but post that list of programs(apps) up, that might shed more light on it.
what bands do you usually have it on? e.g. 3g gsm dual
you could try removing some applications and make a list of what you have removed and see if it makes any difference, then you can rule out which ones cause problems. then gradually re-introduce your programs(apps)
has your n900 every run out of battery or have you seen it getting low and just instinctivly plugged it into charger?
which power are you using v47 did you do the blacklist thing?

echo "blacklist bq27x00_battery" >> /etc/modprobe.d/blacklist