iOS 13.2.3 has a massive problem with the LTE (4G) dropping connections randomly and then reconnects.
Some users are testing the latest beta’s 13.3 Beta and LTE dropouts are no longer an issue.
Issue is iOS 13.2.3 has a massive problem with the LTE and do not contact your service provider and factory reset do not help, firmware update to IOS 13.3 (or whichever it is) when it is available
Hopefully IOS 13.3 when released will fix dropouts etc.
Others issues:
Slow camera panning and zoom function
Update of apps does not work correctly (iPhone /iPad)
Apps freezing during usage.