Pictures won’t synchronise to iCloud anymore
As I have lots of pictures and videos on my iPhone 13 Pro (iOS 17.4.1), I bought 2 TB of iCloud storage a few months ago. The synchronisation of the photos to iCloud was initially working well, until a few weeks ago. I see the number of photos which are yet to synchronize piling up (at 4,777 items rn), although I leave it on the whole time.
iCloud pictures is turned on, and I still have more than 1 TB of free iCloud storage. My wifi is connected, and I even gave the possibility to synchronize with mobile data, if necessary.
Also, I noticed that screenrecords I am making, are not saved when the items are trying to synchronize the iPhone. I have to pause the synchronisation process and restart my iPhone in order to be able to make screenrecords again.
What could be causing these issues?
Thanks in advance for the help!
iPhone 6, iOS 12