Can the cameras being too close together cause the error code 90? We have 2 cameras with an a couple inches of each other, 1 faces the driveway and the other back to front door. They do work when powered on individually. Advice?
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@Kevya Welcome to the community! Placing the cameras close to each other should not make any difference. I have placed cameras side by side without any issues. Error code 90 means the cam is offline. Doing a power cycle on the cam usually corrects this problem. Restarting your router can also help. 
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