Help! Where did my trade go?

[Roy1991]

I'm having exactly the same problem, but I never lost my home province.

Also playing as the United Provinces, I used to have nearly 30K trade income per turn. Suddenly it all vanished.
I've checked all trade routes, and none is being raided. The trade screen however says the my trade route to the America's is being raided
The trade route to India isn't mentioned at all on the trade screen.

I'll trying re-negotiating all trade arrangements later today, hopefully that'll solve it