Kindly complaint to Samsung customer support through Samsung Members App as error report also send log files Along with this error report for this issue and wait for next update may be fix it by Samsung team soon. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
Check Data Roaming: Settings> Connections> Mobile networks> Data roaming to enable it, if disabled.
Reset network settings: Settings> General management> Reset> Reset network settings> Reset settings> Unlock your screen> Reset.
Check another network operator SIM: If the issue has not been resolved, then get in touch with the network operator and try to check with another network operator SIM. Note: kindly contact your network service provider once to make sure there is no issue from their end.
Update device software (If available): Settings > Software update > Download and install > Checking for software update > Software update available > Download > Downloading updates > Install now.
In case the issue still occurs, kindly report the problems with a log file. To share a log file, click on the Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
