Error 403

Every time I switch accounts or try and server hop, I will get error 403 when I try to join the game. I logged out of the Roblox player, deleted the cache, and reinstalled, but nothing works. The issue always comes back. There is not a day where I want to play Roblox without encountering error 403 and I've been putting up with it for months, but it's starting to bother me. How can I fix it permanently?