Many people are having issues with last update, even this problem.
Hi @PrincessDonna and @whoabra ,
We found that the restarting may occur because of a SW problem after an update to the recent T OS SW version. It is confirmed that the malfunctions is caused by the AppSearch solution related to Google Android server updates.
We are working urgently with the Google team to apply a hotfix to address the problem.
Applied new hotfix on the Google server is being distributed to the whole server sequentially by Google team. It may take some time for improvement to be applied to all the target devices. Please keep in mind that even after the hotfix has been reflected on the server, restarting may occur 1 time while using the device.
Restarting manually or automatically can also be performed to fix the problem on the device.
In regard to the speaker issue, do this only happen in calls? Would you be able to run the following test and let me know the results? Head into the Samsung Members app> Support> Phone diagnostics> Speaker.
I can appreciate how frustrating this must be for you @PrincessDonna
I see you created a post here > https://eu.community.samsung.com/t5/galaxy-s21-series/phone-reboots-itself which @TessM replied to try and help.
Unfortunately I see from this post your still encountering issues.
Have you tried any other forms of troubleshooting ?
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "