This problem could arise for several reasons, which may not include anything on your part. It could be your NAT settings or anyone in your party. If your friends' NAT settings are not set to "Open", it could cause this type of problem. First, check your
NAT settings, and then possibly bring this up to your friends.
If NAT settings aren't the troublemaker here, I would then clear your system cache and maybe even re-download the latest update. First, try
this to clear your cache. Then, try deleting the latest update from your HDD and re-download and install it. Let us know how it goes.
Good luck and game on!
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