I believe the camera can loose the memory settings with a power outage.
Yesterday our power distribution system (the stuff out in the street) had several cases where the automatic protection from trees on the power lines instantaneously dropped the power then quickly brought it back online cycling the power up to four times before becoming stable again. This cycle occurred three times. The cameras were powered but turned off. After the third episode the camera went online. I could tell this happened because I started receiving notification of detected movement.
This tells me that power line protection is going to be required. Something like an uninterruptible power conditioner. Or drop the little power pack and go with a back-up DC power supply.