This router fails to maintain a stable wifi connection to my new iPad 2021. The iPad connects readily at first, and after a time - sometimes minutes, sometimes an hour - it drops the connection with an error message ' incorrect password', and the SSID. To get it to reconnect I have to either turn the iPad off/on, turn the router off/on, do a reset of the iPad's netwrok, do a hard restore and so on. But whatever I do, the problem returns quickly. 

I have several other mac devices  - mac mini, macbook pro, iMac, and iPhone, and none have this problem. My previous iPad, which died with a cracked logic board recently, worked fine with this router.

Is this a dual-band issue?

Thanks

John