Yes there is. Im using 5 models HDW3541TM-AS directly to the nvr poe and 4 models via poe switch. These models are HDW5442TM-ASE, HFW3849T1-AS-PV, SD3A205-GNP-PV and HFW3541E-AS.
The problem remains even the alarm trigger from directly cameras on nvr or those that are connecting to poe switch...