My S10Plus is restarting

You may try this troubleshooting way.

Fix Samsung Galaxy S10 keeps rebooting issue: Master reset

Random reboot for Galaxy S10 is usually caused by bad software only. If nothing has worked so far, try wiping the phone with factory reset. Factory reset will wipe your apps and clear your personal data from the device. Be sure to back them up ahead of time.

To factory reset:

Turn off the device.Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.When the Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).Press the Volume down key several times to highlight “wipe data / factory reset.Press Power button to select.Press the Volume down key until ‘Yes — delete all user data’ is highlighted.Press Power button to select and start the master reset.When the master reset is complete, “Reboot system now” is highlighted.Press the Power key to restart the deviceGet Samsung help

If your Galaxy S10 keeps rebooting still after wiping it with factory reset, that’s probably bad news. It only means that the issue not something that you can address on your level. You must contact Samsung and let them diagnose the phone. Visit your local Samsung Service Center for help.