WRT1900AC 5 GHz WiFi LED lights turns off after few days

This is a weird issue. After a few days of flawless working, suddenly the 5 GHz signal LED lights on the router (WRT1900AC) goes off. Clients on 5 GHz are connected fine and everything on router page looks normal. Turning off all activity lights from web interface and turning it back on doesn't restore the 5 GHz signal LED. 
Last time it happened - I left the router to run to see how it behaves. It started dropping internet connection speeds to bare minimum after a day. It appeared like throttling and after a while all clients were not able to access router admin page. Then forced a power reset that brought back everything to normal. Now it's gone again after a few days of continuous run. Looks like a pattern that I cannot interpret.
Anything specific that can cause this issue?
Note: Running the latest version of firmware.

Good to hear. I'd go with Linksys. Even though I maybe a "refurb", it's probably been thru testing and should work well. Nothing wrong in getting one from Linksys. At least you'll have a warranty with Linksys after you get the one from Linksys and have a case #. 
Let us know how the RMA one works out. 
Cstmkr wrote:
I spoke to Linksys support. After reconfiguring the router and verifying settings again, 30 minutes later the 2.4 light turned off, even though I had a connection. I called them back as instructed, as they suggested an RMA through Linksys, not Amazon. The only downside to that is that I have to pay for shipping the defective router back to Linksys.
I feel a little more comfortable getting my replacement router directly from Linksys. I will update this post in about a week.

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