At my startup we just bought 4 new 2017 13" MBPs. We bought some expensive USB c to HDMI adapters so we could connect two monitors to them.

3 out of the 4 MBPs have a fault which causes the second screen to flicker and bug out. We tried every combination of the adapters but the 3 MBPs were consistently faulty.

After searching the web, it turns out this is a very common defect in them since at least 2016.

The repairs will be covered by Apple care, but it doesn't excuse the fact that our brand new laptops have to be sent for repairs before they're even used.

Plus we've lost time whilst we wait for them to be fixed.

Learned the hard way to make sure we buy stock in advance so we can test and repair it before it's needed.