Photo Libraray Videos Issue

Hey there Amer-iPhone,

We'd like to help get your videos working when you need them, and not just some of the time. Let's rule out some possible causes, along with learning more about what's happening:

1. You mentioned that a restart works, but only temporarily. What exactly occurs when you tap the play button on any video, and when did it first start to occur? The more details you provide, the better we'll understand what's happening.
2. Do you currently have iCloud Photos enabled? You can check under Settings > Your Name > iCloud > Photos. If this is enabled, you will need to be connected to Wi-Fi or cellular data to access and play the videos.

Cheers!

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

Was the issue solved? I am facing the same issue