For the 2nd time, my BB7280 has experienced the JVM Error Code 506 which basically locks up the entire unit. I am using OS 4.0. The only way I have found to fix it is to completely re-install all the OS and add in's and start from scratch including resyncing from my outlook which does take some time. If this happens while I'm in the field I am SOL for e-mail and phone. Anyone else have this issue and what causes it?