We just got another X and an incredible too. So far no problems that weren't fixed immediately by getting rid of whatever dowloaded app caused the problem.
We are now making a list of apps and downloading them one at a time and making sure it doesn't cause problems first.
Some of the apps cause conflicts. It helps to read the comments before downloading.
Jim, it sounds like your phone was in a loop trying to upload pics or videos to the net. Once I uploaded a 100 meg video that it didn't like for some reason and it kept trying over and over again to upload it running the battery down.
Now you can watch movies that don't cost a quarter for five minutes Larry!