Kicked from a game I won

So I was playing a game and I had won it got to the post game screen then it pops up “leaving ultimate team” I log back in and I’m greeted with “disconnection warning” I lost the win even though I was post match? I’m sitting in div 3 and I find it hard enough to get wins never mind have them taken from me this is a issue I’ve experienced for a while and I’m sick of it and it always comes back to “internet” but tell me why it happened to me at a different house too? I’m just hoping my win can be restored because if it keeps happening I’m just Gona quit the game again like I already did for different issues