I just got Marionberry, and find it impossible that this is a networking issue. Here's why: we have two PS4s. I was playing on nr 1, working just fine. My son wanted to join, so I logged out of nr 1 and handed him the controller, and went into my office for PS4 nr 2. Logged in, just fine. He logs in, gets Marionberry. I'm logged in on nr 2, works great. We restart router, PS4, the lot, nr 1 still gets Marionberry and nr 2 is just fine. On the same network. No WiFi, both are cabled.
So, whatever Marionberry is about, it CANNOT be just networking. What other causes are there for Marionberry, APART from networking?
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The situation you describe does appear to be an issue with conflicting network traffic. I will pass this info on to the team to investigate possible causes.