Firmware 5.0 - random blackscreen known issue?

Hello,

yesterday I started to play some PS4 again. In the meantime, while it was in rest mode for many weeks, it downloaded firmware 5.0 and I installed it.

After playing for a while, I got a few blackscreens for like 1-1.5 secs, the sound and picture is gone and then its coming back.

Does anyone know if this is a known issue with firmware 5.0?