I have a BH2 and have experienced this to much frustration. Reboot lose apps. I started using Titanium backup and put back missing apps when they drop off. I have found that flashing a ROM that supports APP2SD seems to take care of the losing apps problem. I found , prior to using an APP2SD ROM, that when I have too many apps installed, even if there is memory remaining and available, that is when apps would disappear.