Feedback for R7000 New firmware 1.0.9.18

I've had my R7000 for a couple years (can't recall when I bought it but I think it's been a couple years). I updated the firmware when I initially set it up. Ever since then I didn't bother doing any updates as it was just working fine.

So had some downtime for Christmas and did the update to 1.0.9.18 on Dec 29th. Didn't think anything of it, and had no idea there was a major issue. I didn't make note of the firmare I had prior to the update.I did not do a master reset afterwards.

Then my Brother wireless printer dropped offline (on 2.4Ghz). I rebooted the R7000 and it eventually came back. Later disappeared again. Rebooted router again. Printer back online. Later noticed that my Nexus Player which automatically likes connecting to 5Ghz is saying no internet. Rebooted router and printer connected again, and internet on 5Ghz is back. Watched a movie no probs and went to bed.

Next morning checked printer and it was still online. But my Nexus player and iPads which were on 5Ghz can't connect. Tried changing channels (from 153 to 161) no change. Reboot fixes the connectivity.

So It's odd. I am having the opposite issue to many of you. My 2.4Ghz seems stable for the past few days after the initial couple reboots. However my 5Ghz keeps dropping internet connection. I can connect to it, but the internet is dropped. I have both 2.4Ghz and 5Ghz networks running and both also have Guest networks so 4 networks total. All have separate SSIDs.

I have not tried the hot fix (1.0.9.20) as I don't know what more damage it will do.