They did not do it or are running the demo... Did they check for memory leaks? Your team doesn't seem like they know what they're doing
Your operating system along with the BI installation and database folders should be on an SSD. The only thing that should be stored on the WD purple drives are the recordings from the cameras. Having 33 cameras and the OS on a single 1TD purple drive is too much. The purple drivers are not designed to run an operating system and run at a lower RPM. You need to have the proper computer hardware before the system will run properly.