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 also 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.
You can reset your device by following the steps. 1. Kindly create a data backup of your device via the SMART switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite. 2. Remember the Google password before resetting the device because it is required during initial setup. 3. If you do not remember then advise to reset (Forgot password) his/her Google account.
Path: Settings> General Management.>Reset>Temporary cloud backup or External storage backup>After backup tab on Factory data reset to reset your device to its factory default settings. This will erase all data, including files and downloaded apps.
In case the issue still occurs, please visit the service centre for a physical inspection of your device. You can locate your nearest service centre with this given link: https://www.samsung.com/in/support/service-center/
