Did you make any router changes, add any alternate devices, or update the router firmware in between installing the first camera and trying the second? Or were they added at the same time? A list of some POE capable models are below. I would think the VC727P would be a good choice, but any from the list below might work.
- Indoor/Outdoor Mini Bullet (ADC-VC726)
- Indoor/Outdoor Bullet Camera (ADC-VC736)
- Indoor/Outdoor Dome (ADC-VC825)
- Indoor/Outdoor Dome (ADC-VC826)
- Indoor/Outdoor Turret Camera (ADC-VC836)
- Pro Series 1080p Mini-Bullet Camera ADC-VC727P
- Pro Series 4MP Bullet PoE Camera with Varifocal Lens (ADC-VC728PF)
- Pro Series 4MP Turret PoE Camera with Varifocal Lens (ADC-VC838PF)
- Pro Series 1080p Dome PoE Camera with Fixed Lens (ADC-VC827P)
- Pro Series 1080p Dome PoE Camera with Varifocal Lens (ADC-VC847PF)