My Arabic list of channels shows that all of them are still there with the same signal strenght. I have it on Abu Dhabi TV right now with a signal between 80 to 90 %. My experience is that any shifting of the dish position due to wind will make you do some readjustments. What I did when things like this happen is that I use Diseq 1.2 to nudge the dish east or west just a tad and see how it affects the signal. If that works, then I save it manually under Diseq instead of USALs.
The only problem is when the shifting happens in the elevation. For that you need to go up there and fix it. Good luck