Since your PTZ slows everything down over time, it is probably either a network issue or a memory leak issue in BI. Regarding the network issue, it is difficult to fully understand how everything on your network is connected. It would really help if you posted a diagram much like the one I posted in #13.Router is 192.168.1.1. BI computer and cameras are all 192.168.0.NN. I cannot connect to the same switch, as the PTZ is high wattage. I go from the "main switch" where all the other cameras are connected, to the "high wattage switch," and from there to a POE splitter, as the other camera requires power to its 12V connector. It works fine on its own, but once you add the other cameras, it slows, then stops, and then loses connection. CPU usage is through the roof at that time.
In regards to a possible memory leak in BI, don't try and select the cam, just feed BI the IP address and let BI search and connect. Also if you are using the latest version, revert back to the last stable version. Finally, it could be a driver issue. While I have not had the CPU maxing out over time issue, I have seen threads here where that has happened and it was due to a driver problem. Anyone else remember or have a link?