I have upgrade my unifi from 300Mbps to 500Mbps. They also upgrade the router using skyworth that combine GPON and modem. But from the day they installed the modem, my connection are not stable. got high latency and also time out when ping to google dns from pc and other device. but when ping from the router itself looks like okay no latency and time out. is it because of the modem or the device.