Has heat been an issue for this device? Would it if left along for a year? How about the attached USB drive? I understand it has no on off button. Can it be rebooted remotely? Seems its 4 cams max. Can I hook up more but only record for 4? Or do I need to buy an additional unit? Other than cost, why did you choose this over an NAS solution? If I am using a dual band router, would using a separate band help the bottleneck issue? OR is an access point switch setup the only way to work around it?