Same for me, however after this crash, my GPU is stuck at 99% and I get 20-28 FPS on low with GTX 1050.
Before I started the top gear mission, I was running 40 FPS on high, all smooth, 38% GPU usage.
I have taken the following steps, alas to no avail:
1. Update drivers(When has this ever worked for someone lol)
2. Set GPU as standard in Nvidia Control Panel
3. Optimize Horizon 4 in Geforce Experience
4. Restart PC
5. Force usage of GPU by using external monitor through HDMI(port is linked to GPU)
6. Shove my foot through my keyboard
Task manager only states 3% GPU usage when playing and laptop does not seem to spin fans very hard. And believe me, when my GPU is at 99% normally it sounds like Alonso's V10 Renault(see Hamilton's reaction to my GPU here:
Hamilton blown away by Alonso's V10.