There's been quite a few posts on this already - make sure you only use alphanumerics in your 5 GHz SSID and WPA key.
In the specific ASUS Forum:
Posted:10/18/2014 4:21:00 AM # 1
I am now on my second RT-AC87r.I returned the 1st one to best buy and ordered a
second which has the same issues. The router is great except for one issue which
others are having as well from the tech forums I am seeing online. Anytime you
reboot the router when it comes back online the 5ghz band will not re-enable and
time sync warnings appear in the web admin interface which can't be corrected nor
can you re-enable the 5ghz band in the web interface. All other processes and
settings in the router return to their normal status after a reboot. The only fix for the 5g
issue which works every time is a factory reset and "manually" setting everything up
again. I am on the most current firmware version 3.0.0.4.376_2769. I plan on
keeping the router because otherwise its awesome in every aspect. I previously had
an RT-AC66R and never had any issues like this. I know this a new unit on the
market and being an IT professional am very understanding of new product bugs. I
don't intend to send it in for warranty repair as I rely on it for work and I don't believe it
is a hardware issue since the factory reset resolves the issue every time. I am
hoping a firmware update will be released soon to resolve this one annoying issue
with an otherwise perfect router. Has anyone else experienced this issue?
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vPic
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From: United States
Posted:12/20/2014 10:16:00 PM # 2
Hi Todd,
I have not experienced the same as you, but I do seem to have a related issue.
I have serious performance issues managing the device if only connecting to it via the 5GHz band. The pages take forever to refresh when clicking between tabs.
For example, if I simply logon to the device while connected to the 5GHz band, simply clicking between the 2.4 and 5GHz band tabs for a simple 'System Status' takes minutes before the screen refreshes in the browser.
When I switch to the 2.4GHz band, results are instantaneous.
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Mark W
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From: GBR
Posted:12/30/2014 8:28:00 PM # 3
Have you tried installing a different router firmware:
I recommend Asuswrt-Merlin - custom firmware for Asus routers
www.lostrealm.ca/tower/node/79
Resolved my 5ghz wifi issues. It even resolved my surface pro 3 5ghz wifi limited connectivity issues!
Mark
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Elemino
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From: United States
Posted:1/14/2015 3:18:00 AM # 4
I'm having the same problem. Like you I returned the first unit thinking it was defective. Now I'm having the same issue on my second router... This is pitiful.