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RBK 853 5gHz Wireless Backhaul Issues
About 30 days ago, my otherwise rock-solid Orbi 850 system (RBR + 2 RBS) began to slow way down. After some troubleshooting, I noticed the backhaul was using 2.4 gHz, not the dedicated 5 gHz band and...
Refurbished RBR850 arrived yesterday. Initialized it and replaced my old RBR with refurb about 1 hour ago. Used backup config file to set up refurb and re-synced sats. After about 10-15 minutes settling time the system came back to daisy-chain topology. 5 gHz backhaul (see screenshot) is working and speeds throughout property are back to historical numbers. (Over 3X faster than when 5 ghz backhaul stopped working).
Obviously, my original RBR had some sort of tx/rx problem in 5 gHz band. All is good...for now!
I swapped the locations of my RBSs. Got the same result–no 5 gHz backhaul. After that test, I brought an RBS into the same room as the RBR, placed it about 8 feet away, and powered it up while watching the web "Attached Devices" page. As the RBS finished syncing, it initially showed it was connected to the RBR via 5 gHz with a "Good" backhaul status. Within 60 seconds of noticing that, I watched the "Connection Type" change to 2.4 gHz and it stayed there. Absolutely zero WLAN Backhaul Tx/Rx Pkts listed on the System Statistics page (As per original post screenshot.).
Starting to think my RBR has lost ability to transmit the backhaul frequency. I used the ancient iOS Airport Utility app to search for signals. It shows the 5gHz backhaul (Ch 157) emanating from each RBS but nothing coming from RBR. Now what?