My squad and I have been having the same issue. Nobody pressing the Xbox button, but itβs been very spotty to maintain connection to a squad or match. Even in the main menu it took several attempts to get out 4-man squad together without someone joining and then immediately disconnecting. Not just one player, either. Three of our four players had this problem at some point or another.
The problem has continued into actual matches, too. One squadmate disconnected three times in one match, with the error message saying he lost connection to the EA servers. We have never had this problem in 4-5 months of playtime.
Can we expect a fix? The squad has decided not to play until the stability issue is solved.