As described, if connection is lost when using certain Apps, you may have a problem with DNS. Choosing a different DNS provider to your current default settings may resolve the problem.
For recommended DNS servers (configured at your home router and/or your iPad), you might choose one of the following Recursive DNS Providers (IPv4 and IPv6 addresses included below):
Quad9
9.9.9.9
149.112.112.112
2620:fe::fe
2620:fe::9
OpenDNS
208.67.222.222
208.67.220.220
2620:0:ccc::2
2620:0:ccd::2
Cloudflare+APNIC
1.1.1.1
1.0.0.1
2606:4700:4700::1111
2606:4700:4700::1001
If you are unsure how to change your iPad DNS settings, this page provides a thorough tutorial:
https://appleinsider.com/articles/18/04/22/how-to-change-the-dns-server-used-by-your-iphone-and-ipad