Several people in my ally have reported major connection issues when on Cellular. They found disabling IPv6 in the APN settings resolves it but not all carriers allow this to be disabled. Verizon for example it is set by the APN connection and is not an option to change. Any update on when Kabam will get this fixed?
https://hide.me/en/knowledgebase/how-to-disable-ipv6-on-android/