Restarting Netcam Studio can help but not because it’s sending any special command or anything like that.
IMO it’s more the camera which runs out of sockets or out of streaming channels or something like that and when NCS tries reconnecting every 20 seconds it’s kind of flooding the camera’s I/O.
Letting the camera alone for a few minutes (while rebooting Netcam Studio) may also help it to recover automatically.