My NVR model DS-7608NI-E2 / 8P version is "V3.4.91 build 161220" NVR are hung one times around 2 or 3 day. In this NVR hung we can ping these NVR IP but we can't call GUI from any browser and record also can't record. We saw " Local: Abnormal Shutdown" log in these NVR. After reboot the NVR we...