Destiny 2 is not played on servers, it uses a hybrid peer-peer network. When you disconnected you would have seen an error code. What was it? This will help narrow down the problem you're having.
Please Note: Using other games to troubleshoot issues with Destiny 2 is never a valid form of troubleshooting. All games use different networks which is why it's totally possible to have issues with just one game.
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when It happens again I'll send the error code over, sorry just didn't take it at the time since I was frustrated