I will try to better document some of these issues, and then I'll provide that information to you. Please tell me, though, how you think that any connection issue on my side could cause a desynchronization error with a certain serve hit to the CPU player in an online game in doubles, such that the error occurs every time that I use that serve (keep having to redo serve) until I finally quit with that serve and use a different one to get past that point. Isn't it more likely that a bug in the game or something to do with the game is causing the error? Even if there were a connection problem on my end, why can't the game handle this? Certainly my connection isn't changing when I use this serve, get the error, use the serve, get the error, use the serve, get the error, don't use the serve, don't get the error. I didn't change my connection to not get the error. This happens in many matches. How could this possibly be related to my connection? Why can't the game deal with things like this better? Why does it have to generate so many errors. By the way, I am using the same connection that I have always used, going back to TE2006. I was playing wirelessly lately, but for the last 24 hours, I have switched to wired, and that made no difference. I could say more, but it wouldn't be appreciated, I think.
Now, if you accept that possibly some are using lag switches, then maybe this may help. Otherwise, what are you left with? Bugs in the game, I think.