Hi, I wanted to share here my experience with that issue.
I am on 4.18.3 and I encountered this same message on my log
LogNet: UNetDriver::TickDispatch: Very long time between ticks. DeltaTime: 30.23, Realtime: 30.18. IpNetDriver_1
When I first open the project and start the preview (in my case VR) it runs perfectly. I open a level in a glimpse. But on furthur attemps i am starting to have the freezing issue long timelapse and the message above.
Every time I restart the project, it works fine again.
So it’s like that IpNetDriver that doesn’t like to iterate more than once…(I mean it works fine only when it’s IpNetDriver_0)