as previously stated,
reorder cameras to replace current ones might be a last resort; but only if further investigation points to a 'bad' camera
changing network addressing configuration to a new scheme is not necessary
it is highly unlikely that system hardware has anything to do with the camera issue(s) you describe; changing or updating these would not be recommended
ideally, remove the off-brand switch from the configuration would simplify the network and help eliminate possible issues
from what's been described there is no obvious reason(s) for the poor viewing performance of the cameras
additional background information....
are the cameras and BI the only devices connected to your network; if not, what else are connected and to which switch?
the switches are Gb, have you checked what the auto-config settings of the 2.5Gb NIC?
you may want to manually set the NIC to 1Gb full duplex.
what is the network utilization (task manager or resource monitor) of the NIC?
besides BI, any other applications/services/uses of this system?
(have to ask) you are manually configuring the new camera with an available ip address?
how are new, and existing, cameras configured; which codec, hardware acceleration on/off within BI
what are the video settings on cameras; cbr/vbr, max bitrate?
back to POE available wattage; have you tried unplugging an older camera when connecting the new camera to see if the new camera becomes stable?
which "Pale Moon" browser have you tried, is it the 32bit version? most current browsers have updated their security protocols to "current" levels which are now too new for older cameras. which version of windows are you running; 10 or 11? 10 still has the old-ie, 11 has edge with ie compatibility mode. Firefox versions pre-74 and Chrome versions pre-81, if you can find a download, should be able to connect to older cameras. (old Firefox
downloads can be found here:
Directory Listing: /pub/firefox/releases/)
once you have the ability to reconnect to the cameras, it would be good to
set key frame (i-frame) and fps to the same value on each camera; the .5 and .3 values ideally would be 1
ensure upnp is disabled
manually assigned IP; address, mask, gw