Like @mufasa said you need fast and reliable SSD or USB stick for recordings. Most USB sticks are fast with small files, but when you copy 1gb+ file writing speed tends to fluctuate which causes recording process to stop. For example only SanDisk Extreme Pro USB or SD card can handle recording with no errors. I tested two different models of SanDisk Ultra with no luck. Had to buy Extreme Pro SD.
For example:
Sandisk Ultra 32GB USB 3.0:
Sadisk Ultra Luxe 32GB USB 3.1:
Both causing errors while recording on Prime 2.
Sandisk Extereme PRO SD 64GB:
Sadisk Extreme Go 64GB USB 3.1:
Both works fine with steady writing speed. Problem is caused by buffering system of Engine OS. It writes recording internally for some time and then when ran out of internal memory it copies file to destination drive. So the file is large and USB stick without steady writing speed with larg files are causing recording process to stop.