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Hello, I'm new to the site and CCTV. I have just purchased a Swann DVR4-4400 with two cameras plus i purchased 1 extra camera. Problem 1- I purchased a standalone outdoor microphone from Maplin UK wich connects via the camera power cord splitter and plugged audio phono into back of DVR. Sound was fine but after a short while it seems to die, it hum's a little then crackles and dies. If i try again later it will work again for a short while...What could be happening?Problem 2- It has 720P resolution but only offers 4 days continuous recording unless i lower resolution to 960H then i would get t