jay999pro,
Thank you for those answers! The good news is that I still have a few steps I can recommend.
Can you try going into your team via the companion app and deleting your squad? Not the players themselves! Just the squad. It sounds odd, but I've often seen this solve the issue for other players.
If that doesn't work, can you try using the steps in this article to delete potentially corrupt files within your game? I know you've done a reinstall but these files are often seperate.
Are you having issues in other online modes too, by the way? Or is it specific to UT?