ipad not connecting help

Hi loosing my mind here. I have two ipads both workrd fine till few days back now 1 of them displays not connected to internet for updates or safari etc. So far tried..turn off, reset network on ipad settings, tested on second network which works for other ipad but not the faulty one. Faulty one does find both networks has strong wireless signal for both but keeps error msg that says cant connect

Have you rebooted your router? Many times that helps

Even if one works perfectly. Will give it ago anyways thanks