I have the same problem as the two guys before in this threats:
I use a Core X Chroma incl. GTX 3070 Ti (manli) with a Blade 15 (2018) connected with 40 GB/s TB3 Cable.
The Laptop crashed in over 50% gameplay time playing Riot's Valorant or Watch Dogs Legion, but not at games like CoD:Warzone.
I tried to update BIOS and GPU drivers, but nothing works. Even reinstalling Windows 10 doesn't work.
When just using the Blade 15 everything's fine, but I just bought the setup to power up the Blade 15 and reduce heat or fan noises :-/
I'm looking forward to a solution using both great devices, Blade and Core X Chroma for gaming.
Best regards