I have an 800 and 1000 and I know at least one of them (defo happens on the 1000) complains when I ask it to route to somewhere 100k away. It says the calculation will take a long time, consider adding via points. I of course tell it to shut up and take me where I want to go.
Not that I am aware of when using the on device routing option (where to). But I am using a rather old device, the 800.