Network disconnect issue in S21 FE after july security update

[krishnamurthy089]

Very frequently i am getting "No sim card inserted" error popup. While using phone. And network connection will get lost in SIM slot 1 (Jio) restores back after few seconds. And my network preferences for data, call, and Messages will get changes to SIM2. 

Also this issue occur while i am on call. 

This is very annoying everytime to set my network preferences and also ongoing call will get disconnected.

Note: This issue starts happening/I have noticed the issue after July security patch update. 

[Anonymous]

Reset the network

[Anonymous]

If not do work factory reset after backup using smart switch

[goodthings]

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, interchange Sim in slots, 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.

[goodthings]

Your's most welcome to here.