SD Card unmounts automatically after new ICS upgrade.. Prolly not a hardware issue.

So the ICS upgrade for p970 finally reached my country and I updated. It was good for a while then it started to have SD card problems. SD card constantly unmounts and I have to restart it and it becomes OK.

I figured it's not an SD card issue because it happened even if Changed the SD card twice.
I also figured it's not a hardware issue because it becomes fine after a reboot. Then it unmounts after a few hours.. so i have to reboot again.


Can anyone help me? please... Noob here by the way.