Unbelievable. This worked wonders for my 65SJ8500. I've tried everything to fix this issue with no luck until I stumbled on this post. 5GHZ is 5 times faster! I'm an IT Consultant and I know this stuff inside and out and never would have figured this out.
One thing of interest; Running wifi 6 on Channel 161 and did not have to change it to a lower channel...
Thanks so much!