My Hik-Connect App video stream stops and starts?

I have recently had CCTV cameras (Hikvision) fitted along with installation of a Video Recorder and Screen. My build is 'V3.4.104, Build 190424' and there is no update available when clicking 'Check Update'. The Video Recorder works fine but I am having problems with the Hik-Connect App on my Android and Tablet .. i.e. when reviewing playback the stream just stops and starts via the App. Sometimes just watching the live stream on my mobile / tablet it does the same and the live view just...

My Hik-Connect App video stream stops and starts?