• Are you using PM2? How's your ecosystem config file?
• Which Presence and Driver have you configured on your Colyseus server?
• Which version of the proxy and Colyseus are you using?

If you can share the relevant pieces of source code it would be best. Cheers!

//******************************************************************//
const os = require('os');
module.exports = {
    error_file: 'logs/err.log',
    out_file: 'logs/out.log',
    log_file: 'logs/combined.log',
    time: true,
    apps: [
        {
            name        : "game",
            script      : "cd game &&  node dist/main.js",
            watch       : true,
            instances   : os.cpus().length,
            exec_mode   : 'fork',
			env: {
				PORT:xxxx, //proxy port
                DEBUG: "colyseus:errors",
                NODE_ENV: "production"
            }
		},
        {
            name        : "proxy",
			script      : "cd proxy/proxy  && npx ts-node proxy.ts",
            //script      : "cd proxy && node proxy.js",
            watch       : true,
            instances   : 1,
            exec_mode   : 'fork',
			env: {
				PORT: xxxx,
				IP:"10.70.28.139",
				REDIS_URL: "redis://xx.xx.xx.xx:2007/01",
                NODE_ENV: "production"
            }
        }
    ]
}
//******************************************************************//

Version number of Colyseus I use:

"Colyseus" : "^ 0.12.3",
"Colyseus. Js", "^ 0.13.1",
"@ colyseus/proxy", "0.12.6",