Flashing touchbar?

When my touchbar is sleeping (watching netflix etc) it will flash the rectangle a couple of times, wait a while, and repeat. I have BetterTouchBar installed, but uninstalled it and the same happens.

Any ideas? Is this an issue to go to Apple with? Macbook Pro 2018

That looks like the Safari Touch Bar control to switch tabs. Maybe use View > Customize Touch Bar … and drag all Safari controls off the Touch Bar?