I recently purchased an Archer A9 on Amazon. On initial set up everything worked flawlessly. We are consistently pulling 100+ mbps on wifi. However, in recent nights I've noticed that our 2.4 ghz connection is very spotty. Sitting a few feet from the router I can be connected to 5ghz with 100+ mbps and switch to the 2.4 and either have no connection or <5 mbps. The 2.4 ghz light is green on the modem. In using a wifi analyzer app, it seems like the network disappears sporadically (I see the signal as strong and then the next secons it's entirely gone). The same doesn't occur in tghz (signal is strong and consistent). The issue is I have multiple rokus that only connect to 2.4ghz which means the unstable connection will not work.

I've scoured this forum already and seems like it may be a firmware issue....but I have the most up to date firmware. I have played with most settings (changing the channel, channel width, signal power, mode) and nothing seems to help. Open to any suggestions!