Sep 10, 2008
-   I have the same problem. I live in a high desert, and the weather here goes from 20 degrees at night to 90 degrees in the day.
One day though i was laying in the sun at only 80 degrees and now my keypad won't work. This phone has been in more extreme weather than that though.
I can turn it on, but only if i take out the battery then put it back in.
After that, it stays on, but if i push any one of the buttons, it will respond to it, but if i push any others, it will ignore the last action and respond to only the second one, then shut off.
E.g. If i push the 1 button, it will respond and show I pushed the 1 key on the screen. But if I hit any other button, it will erase the action i did earlier, like it will delete the 1 key action, and show I hit the other button for about a second, then it will shut off.
I want to try the oven method and/or sticking it in the freezer.
Will doing any or both ruin my phone?
And if I try any of the methods, should i take out my battery and/or sim card?
Hoping for your answers soon,
Thanks.-  
TK11