Recently picked up a GT-AX11000 and I've been fighting DFS events when using 160MHz on 5 GHz-2. About once a day, it would revert back to 80MHz. Decided to test older GPLs to see if the DFS events changed and noticed that on 386.4, 5 GHz-2 is no longer monitoring for DFS events. Not sure if this was a bug in the source code, due to the downgrade of 386.5_2 to 386.4 but at least it has fixed my issue
386.4
386.5_2
386.4
386.5_2