Nakamichi soundbars and new WiFi troubles

For quite a few years now our Nakamichi 7.2.4 and our Asus routers have played nice with each other. I had the router set to one of the recommended 5ghz channels with no issues with wifi interference. Well the other night we had a prolonged power outage for several hours. Ever since then, our wifi, specifically on 5ghz will die when the Nak soundbar is on. I’ve gone in and played with the DF Frequency on and off settings and then have set the 5ghz channel to one of the recommended ones from the Nakamichi support page. The 5G will start working again. However, after the soundbar has been shut off again for some time when I turn my tv/soundbar system on, once again my 5ghz channel will be barely working. I keep going into my Asus router settings and specifying a recommended channel, but it seems to only be working for a temporary amount of time. What could be going on? When I go back into my Asus settings, the 5ghz channel hasn’t changed…so I don’t know why my 5ghz channel keeps dropping off when the Nakamichi soundbar is on