Thank you everyone for helping out, it is much appreciated. This is a little update on the situation…
After spending many days and weeks pulling my hair out trying to figure out how to fix this issue, I think I might have found part of the problem…
As you know I been changing firmware going up and down trying to find something that would give me a stable 5GHz connection. All in all, some 4.x firmware where better than others but nothing rock solid. I decided to upgrade once again to the latest 4.4.6 version. What I did next was to remove WPA-3 from the settings and only use WPA2-PSK on both the 5Ghz band and the 2.4Ghz band. That seems to have fixed the major issues I was having. I also manually configured the 5GHz band to use channel 161. All in all, as of this morning, my 5 GHz signal has been rock solid. It seems that some adapters do not play nice with WPA-3. I will keep you all posted and see if this stability last. I’m also wondering how my future Flint2 will handle this with the default options enabled…
Thanks again for all who have tried to help me fix this. An update will follow in a weeks time.
Me