Samer,
You should try to do a reset and see if this solves your problem. Do you know how to do this? Go to the save/enter function, go to power on setup and then hit default. This will reset all the settings back to their factory default. I don't know if this will solve your problem but it is where I would start. I have found this to work when things aren't working the way they should.
George Kaye
Kaye's Music Scene
Reseda, California