i am interested in your opinion, because I have been plagued by 5G issue. have you tried to make regular computer into sleep, if there will be connectivity issue? about 87u's 5G issue, i even have been suspected to be hardware flaw, rather than firmware issue. but I saw something in this forum seem to can overthrow my doubt, so confused......
at present, it seems that most of the complaints about the 5G issue is from apple device users. i was thinking, maybe this problem can not be solved by asus/quantenna, maybe they need apple's help, but this seems ridiculous.
Yes, I have done that: when waking the computer up from sleep it will take a couple of seconds to reconnect and then everything is working as it should.
So far I have two devices at home which disconnect from the 5GHz sometimes: My Asus Nexus Player set top disk (however, it is known to be very unreliable regarding wifi, not just with this router) and a Sony Xperia M Android phone. Oh, and I had a visitor for a couple of days lately who came here with a Samsung Galaxy Tab 3 - that one also seemed to be effected by this problem.
Otherwise, when it comes to mobile devices, I have a Nexus 7 2013 and a Nexus 9 and none of them have any issues (they used to have though, when I was still experimenting with 5GHz beamforming, but not anymore)