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 also optimize your's device in device care too also clear catche of all apps manually then try to it's again. If not resolves then change Sim. 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.
