I know others have reported the issue and I can attest my own personal issue with USALs and 1.2 with my SG2100 motor and a Viewsat Platinum. It seems ok at first, then for me it slowly lost where it was in the sky, it would take me about a week and I would lose all sats unless I reset everything.
Compared to my Pansat which has been working flawlessly for months now and my Coolsat which I used for about a month and my fortec merc II which I also used for a few months all 3 of them have never had an issue with the motor control
As for a fix, I don't think I have ever seen one or a standard resolution for the problem.