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AlwaysDownloadUsers = true causes stability issues

See original GitHub issue

My test was with a Bot on 2.5k servers split upon 3 shards. Setting AlwaysDownloadUsers to true ALWAYS made Shard 0 disconnect. The Shard would just be stuck in a infinite loop of connecting, then the remote party closes the connection without a handshake, reconnecting and so on until the bot token gets reset. Setting it to false and its stable again…

_client = new DiscordSocketClient(new DiscordSocketConfig()
            {
                LogLevel = LogSeverity.Info,
                AlwaysDownloadUsers = true,
                MessageCacheSize = 0,
                TotalShards = Utility.TOTAL_SHARDS,
                ShardId = shardId
            });

All other shards are unaffected and stable.

Bot ran on a Ubuntu Server with 16.04 LTS