A couple questions...
If you motor to your most westerly sat, is your actuator nearly completely retracted?
Is it possible that the actuator slipped in the collar that clamps around the outer tube?
Ie normally, to get the most range, you should adjust the position of the actuator in the collar such that when it is at it's western limit (for someone in the east)and nearly fully retracted, that it should be aiming just past your far western sat. Ie loosen the collar and when the receiver says that it's at your western sat, slide the actuator within the collar to find that sat. This will give you the maximum range to your eastern side.
What I was thinking is that perhaps during wind, or rough movement (dish frozen, but actuator still pushing or pulling), that it slipped in the collar. If it isn't at the proper position in the collar, it will be impossible to reach some sats one one or the other end of your normal range.
If it looks like it isn't retracted when aiming to the far west, then I'd re-adjust that. You may have to manually motor almost to the west hardware limit, set the software limit, find your western most sat bu sliding the tube in the collar, and then do a resync command for that western sat on the receiver .
Of course, if it looks like your actuator is retracted properly when aimed west, then ignore everything I've said.
Another possibility, is that there may have been physical damage to the hardware limits. I'm not familiar with that actuator, but maybe you got ice or something in the actuator motor box, and when you tried motoring, the ice moved the limit switches. Usually, you'll have software limits on your receiver, and you should never reach the hardware switches, but if there was damage to the thing that runs along the screw in the box and pushes on the limit switches, perhaps the hardware limit is being reached before it's supposed to.
Anyway, just a couple more things to think of.
EDIT: Oops. Looks like it took me so long to write the above that Corrado said almost the same thing. Sorry.