Why does Titanium Backup stop backing up?

[Homer Simpsons]

I have been using Titanium Backup for the last five years for many rooted devices including Nexus 6, Pixel XL, note 3... Recently I got a OnePlus 5, which I love, however, when I make a backup with the titanium, it reaches to about 52% and stops backing up. Iy doesn't even show any error. After reaching about 52%,the notification staying the status of the backup disappears. What could that be? If I go to Titanium, I see the long list of backuped apps for half of the apps, and for the other half, it shows no backup. I was trying to see if there is any interference or app that looks off, but I cannot see anything unusual. I appreciate any help. I can't be without backup. It is too risky for me

 

[Golfdriver97]

Welcome to the forums. Are you doing the backup in a batch? I have found that TiBu doesn't do so well in multiple backups.