mac freeze when watching video

Hi,

Since macOS Sierra, i have a problem when i watch videos:

The mouse and cocoa controls except the video itself are blocked for approximatively 5 seconds, after this time, i can use the GUI normally but 3 seconds later it blocks again, and it do it infinitely. Sometimes, closing the video window solve the issue, but some times i need to suspend activity and log again.

The problem doesn't appear every time :

- When i watch some videos using html5 tag <video>, but the problem doesn't appear on YouTube or Daily Motion, using Chrome or Safari. I tested with .mp4 videos directly in link (i don't see the video format using Daily Motion).

- When i watch some videos using VLC (i tested mp4, the problem has not appeared using .mkv file).

- When i watch video using Flash Player and i put the window below another window (not appears every times).

- When i have a TeamViewer session opened, go to session lock screen and log again (not appears every times).

I can't tell more and i can't find a way to reproduce the issue every times, but the problem is very annoying. I will wait until the next macOS release to do a clean install if i can't find a solution before (and if the update doesn't solve the issue).

This is my configuration :

MacBook Pro (Retina 13 inch, early 2015), macOS Sierra 10.12.3

Screen 1: Integrated

Screen 2: 1920*1080 DVI -> DVI to Thunderbolt Adapter -> MacBook Thunderbolt port

Screen 3: 1920*1080 DVI -> DVI to HDMI Adapter -> MacBook HDMI port

Thanks