Stick Up Cam Noise

Hi, New on here so be gentle with me. I have two Stick Up Cam Wired, one in the kitchen and one at the top of the stairs. Every now they will throw a hissy fit and decide to deafen us with load Static noise coming from the speaker. It seems to happen when sometimes it is recording, but also when there is nothing in the room to activate the camera. Any ideas? I have looked on here and there are posts ref recording static I dont know if these are the same issue. Also from these posts for information there is no electrics withing 35 - 40 cm of the unit so I think I can rule that being an issue.