Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also Flight ✈️ mode on n off one time, restart your's device without any Sim in slots also interchange Sim in slots also turn off power saving mode then try to it's again. 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.
Clear app cache through Device care: Tap on Settings>Device Care> Storage> Clean Now.
The clear cache memory of a particular application: Settings > Apps > Now pick the app you like to clear off the cache memory > Storage > Clear Cache.
Kindly check the same SIM card in another phone or another SIM card in the same phone to verify the issue.
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).
