strange flickering effect with NetworkRigidbody.cs

Hello,

I'm using the NetworkRigidbody.cs script to test my networking, and I managed so far to make a 2 player game syncronised. It's a game with two robots that can move on a map, and both robots can see each other move.

I first used State synchronisation and it worked, but it didn't have interpolation so I tried this NetworkRigidbody script from the official networking example.

The problem is, the other player's robot appears to be 'flickering' on the screen, for a fraction for a second they turn invisible, every 3 seconds or so. I'm testing locally with two unity players. Any ideas what I might be doing wrong?

Thanks! Nick