N900 keeps deleting my contacts
 

Hello everyone,

Though I really love my n900 to death, it seems to be letting me down.
Everytime I turn off the phone, I lose all my phone numbers. Only My IM Contacts remain.

I reinstalled the OS a couple of times with nokia software updater still no luck.
Any suggestions? I hope this isn't a hardware fault. Everything else seems to be working fine. :(