Active Level 3
In my A50 , After one UI 2.5 update my mobile sometimes automatically restart and wi-fi calling is not working properly. 

once go to settings >general Management >reset>reset network and restart your device then check wifi calling
for auto restart follow these steps

A. Clear Wipe Cache Partition.
Steps to perform.
1) Turn off the device.

(Connect with type C cable/type C earphone only for Android 11)

2) Press and hold the Volume Up key and the power button.
3) When the Android logo displays, release all keys.
4) Press the Volume down key to navigate and select "Wipe cache partition".
5) Press Power key to select. When the wipe cache partition is complete, Select Reboot System.
6) Press the Power key to restart the device.

B. go to safemode and observe is there same issue in safemode too
if not then problem may due to other downloaded apps
and if same issue in safemode then try to visit service centre

steps to turn safemode;
long press on power button>
long press on power off option>click on safemode >your mobile will restart and turn into safemode.

Keep in mind that in this mode only inbuilt system app will work

Meanwhile send feedback to Samsung by using get help section
GetHelp>>SendFeedback>>ErrorReport/AskQuestion>choose appropriate section

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Active Level 10

Dear Samsung Member,

Greetings from Samsung Customer Support!


Be assured, to resolve the issue please follow below given steps:-


1. To resolve auto restart issue please follow below given steps:-
Go to Settings > General management > Reset > Turn off auto start.


2. Reset the device:- Before resetting, kindly create data backup of your device via SMART switch mobile application or http://www.samsung.com/in/support/smartswitch pc suite.
How to reset:- Settings > General management > Reset.


If the issue still persist, kindly register your concern in Samsung Members app along with short video, screenshot and error log file(Samsung Members app > Get help > Feedback > Error report/ask question).
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.


Thank you for writing to Samsung.


Warm Regards,
Samsung Customer Support