hikvision model ds-7608ni-e2/8p

We have an Hikvision Model DS-7608NI-E2/8P W/2TB HDD. We are using 6 cameras. The NVR has a flaky HDMI port, if the cable is bumped or the NVR is moved, we lose signal. I’m currently using the VGA output to a monitor with a with a VGA input. It was working with all 6 cameras. After doing a...