Tesla Motors Club

So, was driving on a 2 hr hiway trip using AP. I went to pass a cluster of cars, nice open road (I think I was on AP, but not 100% sure). All of a sudden I get the red steering wheel and angry beep and it said something like "autosteer not available for the rest of the trip due to exceeding autosteer speed limit". I probably had it up to around 90-92 on a 70mph road. I don't have any type of speed limit set in my controls. Is there a max speed number where you get booted from autosteer? It still let me do cruise control. I had to stop and put it in P to use autosteer again.