Poor connection when using mobile data

I have 3 stick up cams that work fine via the Ring App through WiFi. However, when I try to access the App remotely using my mobile data service (service provider is EE) I often fail to connect. Specifically, the app eventually gives in and says ‘Your mobile device has a poor connection’. However, when this happens, the phone indicates a strong signal and other applications are working fine, calls/texts are unaffected etc. Tried restarting phone but doesn’t resolve. Sometimes, app will reconnect but literally hours after trying. Otherwise, have to wait til back within WiFi range.Any thoughts from anyone, or settings that I can adjust behind the scenes? Note, I’m not running any VPN type shenanigan, and Ring app is up to date.Thanking folks in advance…