iOS14 2.4ghz wifi connection issue

Hi Apple Team,

I am having 2.4ghz connection issue on 4 of my Iphone11 after updating FW to iOS14.

If my iphone11 are connected to 5ghz band or there is no wifi signal for a longer period of time and after that if 2.4ghz band is enabled on my router then iphone11 are not getting connected. I am having this issue with 4 iphone11 devices. Also tested with another iphone11 with iOS13 and same scenario works fine.

This issue is happening with broadcom chip router, quantenna chip router and also with qualcom chip routers.