I had the problem of 4 cameras great one more and crash the OS stops responding.
1 switch off Hyperthreading if you have it on.
Use KodiCom but first uninstall all device drivers for the CCTV Card. KodiCom will install its own on the fly.
With the supplier also overseas I have tried at least 6 different software packages and only this fully works.
Shame it is not fit for purpose as I need to be able to save Video to CD/DVD.
Brent