It's my experience that when my dish moves out of alignment, it's always been an azimuth problem, meaning that a gust of wind, or several gusts, have moved the mount on the vertical pole. This winter it has happened to me again. Not by too much , though.
I've had to change my USALS longitude location by 0.3 degrees to the West, to bring everything back into alignment. The same thing happened last year in winter storms, I had to adjust my USALS location to "fudge" the alignment until I could get out in the spring and ZERO it in again.
My technique is simply to go into the motor setup screen, and change the USALS longitude by 0.1 degree at a time, and allow the system to adjust. Whatever value gives my my best quality reading is the value that I keep in there. At that point, ALL the satellites are aligned correctly again. Try this technique, see if it works for you. I suspect that 90% of the alignment problems are "wind caused" azimuth errors and can be compensated for this way.
Brent