Discons have been a subject ever since I've been around, 11/11. Already from 2012 on, when the completion count (coloured buttons) was introduced, the "unexplained" influence to downgrades was significant. Plus, discons have increased importantly in the last year.
WGT always claims that it's not their fault, but experience shows that the games' connection is fragile and very delicate vs. small disturbances, to say the least.
Alas, the Hold-Your-Tongue Tribe of Bay Area has never been good in explaining. Apparently, any information given to their clients would possibly blow their business secrets.