i had a friend with a similar issue . are you getting the same disconnect error code every time you DC or is it a lot of different ones ? for my buddy his disconnect error codes were all over the place and never really made much since because it seemed like it was just giving him random error codes . anyways we tried all of the troubleshooting steps for each specific error code he got and nothing would work . we actually tried everything we possibly find in disconnecting forum posts and after nearly a month we finally figured it out . what fixed it for him was getting a static IP . For him he had to call his internet company and have them set it up for him and unfortunately he has to pay them 10$ a month for the static IP alone on top of his normal monthly internet bill . This is assuming that you are playing on PC as my friend was as well . Not sure if this would make much of a difference if you are on PS/Xbox . If you do have to pay for a static IP with your ISP i would use it as a last resort to fixing your connection problems but if not its worth a shot . Sorry if this doesn't end up fixing the problem for you but i do hope this helps you out .

What router do you have and what sort of download upload speed do you have?