Yeah, disregard that nonsense. There is no way (short of hacking hardware and drivers) to defeat DFS compliance. What you're asking to do is fine, FCC approves, but as you see it is not stable or reliable. Anything that is going to rescan and change back to 160mhz is going to cause an interruption of your wireless, may or may not be a big deal for you. If your router has a wifi button on it just turn it off and back on and that should make it rescan, or use the script posted to do essentially the same in an automated fashion. Still think this is not your root issue though.
160mhz is somewhat problematic, similar to 40mhz on 2.4 (though not as bad since that uses the entire spectrum instead of 1/3 of it).
6A will bring 6ghz. Lower range but more spectrum (and less interference until everyone around you adopts it).
Of course higher frequencies means potentially higher risk to your health. The cell phone companies have gone to great lengths to discredit that research but common sense and a little bit of science knowledge is all it takes to realize that this RF radiation is not great for you.
If my microwave can cook food at 1000 watts of 2.5 ghz, then 0.1 watt of the same frequency 24/7 for many years is going to have some impact. Not to mention the 15ghz satellite signals, 28-39 ghz 5G mmwave, all the cellular antennas running about 800mhz-2ghz, etc. We're slowly getting cooked and your cells are mutating little by little. There are anectodal stories of soldiers hanging out near microwave antennas to keep warm, little did they realize WHY it was keeping them warm, when the antenna was cool to the touch and not radiating any heat. They got cancer. OK tin foil hat off now.
