My Vita has had some pretty serious drift on the right analog stick since buying Soul Sacrifice Delta. It's on and off but can come back a few minutes after stopping. I've tried calibration, rebuilding the database, and restoring the system with the memory card OUT but it doesn't help. It does occur in other games and the browser. I bought the Vita used in July or August, and the Vita may have been opened up before because some of the screws look pretty damaged and after unscrewing the screws amd slightly opening the case it's pretty dirty so it may need cleaning. If I do need to install a replacement analog does anybody know of a good guide for opening up the slim Vita models?