Backup of iPhoneXR in iTune stucks!

Backup of iPhoneXR in iTune stops saying: "iTunes could not back up the iPhone because the iPhone disconnected"!

What could be a reason?

I have a new powerful Notebook, i7, 32GB RAM, 2TB SSD, Windows 11.

iPhone XR with iOS 18.3

The same problem happens now with my older Notebook, although I made with this Notebook

successful backups in the past.

I made some suggestions from Apple site like:

1) I reinstalled iTunes (the latest version).

2) Setting the Battery to Low Power mode

3) Setting Notifications->Show Reviews to Never

4) Setting-> Background App Refresh -> Off

5) Airplane mode to ON

6) Also I replaced USB cable, changed USB port

Still the problem exists. iTunes starts to backup and after 10-15 minutes it stops.

I tried also to make backup using Apple Devices app and it's the same problem.

It looks like the problem is in iPhone. But what?

Please suggest!

Yossi