freezing

Hi, I noticed the front camera video intermittently freezes for a few seconds and will then catch up. Sometimes it will also show random blocky colours too but I generally only see this through the app on my phone. Anyone seen this before? As it doesn't seem to happen to the Rear camera I...

I purchased the subject unit about a month ago. It works fine if I use the webview or iVMS-4200 although with some recording issues that I have yet to figure out. If I use Blue Iris one or all of the cameras in the unit will periodically freeze for a few seconds, leave momentary video artefacts...