My phone would lock up all the time until I cleaned the mini-sd card contacts and the slot in which it plugs into. Considering the age our 6700's are getting, this may be common in our phones.
I discovered this after getting so pissed off at my phone that I threw it against the wall. The battery cover, battery, stylus, and memory card all flew off the phone but when I put everything back together (except the memory card cause I couldnt find it for about an hour) the phone worked perfectly. Then when I found the card I realized the phone would lock up about 20 min after I put the card in. Decided to clean the contacts and voila, no more lockups.
