Needs some help SG 2100 HH ?

I have the sg 2100 made by ?? 100% same as in link.
https://www.satsig.net/polar-mount-4.htm

Problem = went thru 2 of these and or total of 3 motherboards as the actual motor and mechanism still works not the motherboards.

Every time I ground my dish as requested by the insurance company the SG 2100 dies ?? then have to get replacement motherboard.

Also noticed there is a lot of play once the dish is connected 90cm on sg 2100 (120cm capable) about 1 deg or lnb moves about avg thumb width ??

Surely none of this is normal ?