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 cache of all apps manually also update your's all apps too 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.
Go to Settings → Connections → Mobile networks → Access Point Names (APN) → tap on your active APN → Edit → Bearer → uncheck “Unspecified” and select “LTE & NR” → Save the settings → Restart your phone. This may fix the problem. 🔥
