Hello ,I am using seperated network for 2.4GHz and 5GHz networks and I live in an area where frequent short power outtages/voltage fluctuations occur. The 2.4GHz radio comes on quickly while 5GHz takes 3-4 mins to turn on. 

I researched online and found out that since I'm using 160MHz channel , I'm also using some DFS channels(52-64) alongwith non-DFS(36-48) and according to regulations , router has to wait 60 seconds to check if DFS is empty.

I have tried to lower my channel width to 80MHz and using only non-DFS channels(36-48) which is set to 36. However this did not improve the boot up speed at all. 

I consulted my friend who uses Asus AX58U and his boots up in around 1.5 mins 

Please tell me on how i can speed up this ?