Multiple reports have been seen within the Apple Support Communities - and external media sources - complaining of issues with new iPad models inexplicably dropping their WiFi connections.
Try updating your iPad to iPadOS 16.1.1 - this being released earlier today.
If you continue to experience difficulties, you would be best advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at the extreme bottom-left of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:
https://apps.apple.com/gb/app/apple-support/id1130498044
You might also submit a bug report via Apple’s Product Feedback portal. For iPad and iPadOS:
Feedback - iPad - Apple