I've had good luck (so far...) using AC68 on firmware 1031 as a media bridge to my 5300. In fact, I'm kind of in disbelief that it's still working, lol. Used to have problems daily. Also, my connect rate is stellar 1300/1300!Earlier in the thread, if I remember right, this was acknowledged as a known issue with some ASUS routers.
I'm also seeing the issue with my RT-AC88U as a media bridge (with a RT-AC3100 as my main router and a RT-AC87U as an access point). Usually have to do a power cycle on the RT-AC88U once or twice a day. Fortunately, this has never (knock on wood) happened when streaming music or video media with the bridge.
When the issue happens, the AC88U also does not show up as a client when logged into the RT-AC3100. Nor does it show up with ASUS Device Discovery tool.
Sent from my SM-N920V using Tapatalk