Multicam constantly crashing

Hello, I encounter crash problems with the mutli cam function.

My pc works perfectly for everything I ask of it (games, big edits, after effects...)

 but the multicam function crashes all the time. PP no longer responds after a few minutes of editing. 

Often the reading continues but I can't do anything other than close with the task manager...

 (even with the 1/16 preview!)

My project is in 1080p and contains 4 cameras.

My PC:
Ryzen 7 2700x (Intel Core i7-8700K nvidia equivalent)
Asus 1070 8gb vram
32gb of ram

Thanks for your help, that's the only problem my pc is having. 

Is it a hardware or software problem, a parameter that I am missing?