Hello,
I'm having issues with both 386.7_0 and 386.7_2 on RT-AC5300 when QOS is turned on. Works initially for a day or so, then the internet connection is lost. But logging in to the router's interface internet connection shows as connected, but the internet does not work. Sometimes Wifi works and sometimes it doesn't. Very strange behavior. Now running 386.7_0 without QOS for the last couple of days and it's still OK. But I had QOS tuned on 386.7_0 before upgrading to 386.7_2 a couple of weeks ago and had no issues with it, but now downgrading back to 386.7_0 QOS is creating issues when it's tuned on.