[knexx]

Too much crap running. As what others have said get a good task manager that will let you really close apps(hitting "OK" only puts it in the background). And sometimes even though you uninstall programs there are little remnants left in your phone which use up space and registry. Backup all your important information(contacts, sms, notes, etc) then do a hard reset... of course not in that order.

It should look something like this:

1.Backup
2.Hard reset
3. Install only what you really use and of course the task manager.