Remove all cards
Update library (this will clean any files from memory)
Reset setting to factory default
Restart the X5
This should start you off the same as when you received it, then just setup to your liking.
Just install one card and test, then the other if all is okay.
I will keep my fingers crossed for you as this problem must be VERY frustrating.
Edited by Flomet - 5/28/14 at 8:19am