i have been playing destiny 2 sense day 1 and i have always been plagued with getting disconnected from the servers and at first it was due to bad internet but its still happening even after upgrading my internet connection.
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This is something that can maybe be fixed by resetting your modem/ router occasionally or hard restarting your console. Memory builds up in consoles and purging it can fix a whole number of issues, same with modems/routers. If that doesn’t help try playing on a wired connection, it’s always faster than WiFi and could help resolve some of the issues your having, good luck man!