I experienced similar SMS issues this spring and posted about it at the link below, but no solution on my post either. I recently updated to SMS 18.5 and it did not solve the issue. 

SMS map link: https://talk.newagtalk.com/forums/thread-view.asp?tid=778939&posts=2#M6728842



We also experienced the rows shutting off coming out of the corners.

Row shut off issues link: https://talk.newagtalk.com/forums/thread-view.asp?tid=786659&posts=11#M6797105