Merlin Guest Network Crash

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Occasional Visitor
Running Merlin 386.2.6 on an RT-AC86-U with a 2.4ghz SSID set up on guest network 1. Runs fine.

But when I activate a 5ghz SSID on guest network 1 the router crashes and constantly disconnects both ethernet and wifi every several seconds. The only thing I can do is reboot and try and remove the 5ghz SSID before I lose the connection. This happens whether the 5ghz SSID is the same as the 2.4ghz SSID or different.

No problem setting up 5ghz on guest network 2.

Any ideas what the problem might be?


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