AirPi disconnected when use 2 wifi adapter

Describe the bug
When I use 1 ASUS AC56 adapter on GroundPi , Image transmission and RC control work good . but when I use 2 ASUS AC56 adapter on GroundPi ,most of the time they will work together for 2-3 sec and disconnected suddenly,sometimes one of them cannot work( adapter LED off ) .
I tried every 2.0.0 RC version of OPENHD and both Pi3B+ and Pi4B , the problem still occurs.
I once considered additional USB hub , the problem still occurs.
I also replaced the adapter , when I installed adapter A ,it work fine , when I installed adapter B ,it work fine also, but when I installed both adapter A and adapter B the problem still occurs.
OPENHD Configuration is default .
Looking forward to your reply.

How are you powering the GroundPi?