FurryNutz...
whew.. I feel like I've been doing this all day, because for the most part I have… LOL
I moved my router to a direct line of sight giving it about a 16 foot distance. What a day…
I changed to the security settings that you recommended and with build 10 I did see a slight improvement, but I still had intermittent audio only, or sporadic connections using the 5 GHz signal. I should add that at least after I had a line of site and the adjustment changes you recommended I was able to watch TV a little bit better. Obviously being digital, it's either on or off. So I do realize that some of the pixilation that I see on occasion is not from the router.
This probably needs to be posted under the D-Link wireless AC1200 dual band adapter section. But as I had stated as a trial I installed my TP-Link and 600 dual band, USB wireless receiver and today I uninstalled that and reinstalled my D-Link AC1200 dual band wireless receiver. Having had build 9 still installed, when I installed the AC1200 I kept getting an unidentified network using the 5 GHz band. No connectivity problems with the 2.4 GHz signal. This is a frustrating problem that I've been dealing with for a couple of hours.
I reset the router and installed build 10. I was getting similar results for my connectivity with the 5 GHz signal. So even though I saw slight improvement. With the changes you suggested and a direct line of sight, I decided to reinstall 1.10b04, and all my connectivity came back, including the 5 GHz signal, still using the D-Link AC1200. I'm left a little confused as to why the TP link dual band adapter was able to hold a usable 5 GHz signal with build 9 and my D-Link AC1200 did not even get a good connection, just unable to identify network. I even used the Windows connection repair and it didn't help.
This is a lot of work. Testing the router, clearing and switching out FW's. I'm glad to help, and I surely want the best results from this router. I'm a gamer, not a heavy one, but I love the StreamBoost operational concept. If there's another way that you would like me to test either build 9 or build 10, or other, Please let me know.
I will install the recently released v1.11b03 FW and give it a try.