How old is your Pre3 (meaning, how long have you been using it since unboxing)?
Originally Posted by mr-scorpio
I've had my Pre3 (v2.2.4) as my daily driver for just a week short of 2 years.
I started noticing that it was running warmer a few months ago.
About one month ago, I started getting overtemp warnings while in my car, on a Touchstone, slider open, and running GuttenPodder, even though the A/C was on and the Pre3 was in the shade (this used to happen only if the sun was directly on the phone). I.e., it seemed to be getting more temp sensitive.
About a week ago, I started getting frequent "memory critical" messages (the one that tells you to throw away some cards). This was quickly followed by a significant increase in the rate of battery drain, with the battery level dropping rapidly to 0% once it dropped below 25-30%. (Curiously, sometimes a quick trip to the Touchstone would restore the battery level to 25+% in seconds; other times, it charged up at a normal rate.)
As I got more "memory critical" messages, operation slowed down drastically, despite frequent reboots (and even several battery pulls). And then there were the occasional spontaneous reboots...
I also started geting more "missed" calls for which I never heard a ring, despite having plenty of bars. (The Phone app wouldn't load?)
Today, I started getting "the application database is getting full" messages. Great.
My speculation is that I've either had a critical hardware component failure (bad RAM?) and/or there's an accumulation of cruft in the file system. I've not searched the forums for specific solutions, yet, but given the age and condition of the phone (cracked bezel, cracks in the case back) and the fact that I already have a replacement Pre3 standing by I'm somewhat disinclined to pursue it.
Bottom line: If your Pre3 has been in heavy use for an extended period of time as mine has, it's possible that what you're seeing is the beginning of the death rattle that I've been experiencing. I should note that I almost always charge on a Touchstone, even in my car. I've read speculations that Touchstone use may shorten the life of the phone due to the higher temps experienced during charging, so that may be what's happened to my Pre3--YMMV.