Hey, new to this forum and hope that I may be adding something useful with this. I recently installed an independently branded system that uses Hikvision hardware, software and even documentation. The model numbers change a bit but 3 of the 4 cameras are [DS-2CD]2342WD-I that are running the V5.4.1 160525 firmware. The Customer has a particular requirement to run specific night time surveillance only and to review the previous night's events each morning. To lower the overall number of events to be viewed, I had limited the recording triggers to a combination of VCA Line Crossing and Zone Intrusion only. This worked well for 4 weeks and limited the number of recordings of moths and bushes moving triggering events needlessly. Then one night, those 3 same cameras just stopped recording. I visited and checked all the settings again, double checked it worked OK physically and then left. It worked great again but after another 3 weeks, again the very same 3 cameras stopped recording. All the settings were checked again and underpinned the VCA recording with general motion detection but that night it still failed to record/flag the VCA events. Strangely enough, 3 nights later it started to record the VCA events on all those 3 x cameras but I don't know why. Camera number 4 is similar but with 4.0mm lens, I don't yet know what version of firmware it is running but the NVR (basically a DS-7604NI-E1/4N) doesn't show an option for H264+ compression so I figure it is quite an old firmware. Anyway, in reading through your bug testing notes regarding sporadic issues with VCA event e-Mails not sending and etc. it occurred to me that this mysterious condition might be the same bug manifesting itself in a slightly different way. Any thoughts or feedback would be welcomed. The installation is remote and it's a standalone with no network connection so I apologise in advance if details are a bit vague but I am short of much more detail at this point. I have attached a screenshot of the configuration screen of this same model camera that I have set up to try and troubleshoot the problem. Thanks for your time in reading this.