I have been using Blue Iris for several years on this system. It seems that after up grading from 3.0 to 4.0 is where the trouble started. BU will stop responding, the cameras will be stopped all at a certain time and stay that way till you close BU and reopen it. It still records and stores clips as normal, but you don't know that until restarting. Then you can see the clips that were saved during the time that it was froze. the system is a intel i5-6400 with 8 gb of ram. The BU version right now is 4.4.9.10 x64. When its running the cpu usage is around 30%, so I'm pretty sure that its not resource related. This computer is used as a desktop in an office, but can randomly stop even during the night when no one is there. What thins should I be looking for. TY