Spec PS3 & TB : PS3 Fat 40 GB
3.55 v2 TB CFW
TB Dongle 1st Batch ( No Light )
Game Tested Tales of Grace F

My PS3 Always Shutdown Every ~15 Minutes, After Update TB Dongle to V2.61 And Run Perfectly When Downgrade to
v 2.5 and v2.51

Already Done :

1. Downgrade TB Dongle to v2.6
2. Reinstall 3.55 v2 TB CFW
3. Reinstall OFW 3.55 then 3.55 v2 TB CFW
4. Format PS3 Harddisk
5. Reformat PS3 Harddisk Again...

Any Solution or Help For My Problem.

thx