Disconnects while playing on different platforms

Hey guys,

Did someone notice that playin together on different platforms can be really annoying?

My friend is playing on pc while im on xbox.

If we Start a Horizon convoy we can Play like 10mins and then on My screen it says that my friend left the convoy.
Most of the Time it happens while were in an online team adventure Race.

We both got an open nat-type.

If we are playing alone in no convoy everything works fine for us.

Hope someone can help me. Thanks!