This might be either a dead battery or poor signal. Bring the camera closer to the hub to see if that works. You can swap cameras around to see if it's the camera or location. Swap batteries around, too. If it turns out to be the camera or battery, you may be able to swap at the store. Otherwise use the Contact Support link at the bottom here.
If you still experience the same behavior, please contact the Arlo Support Team to further investigate this issue. You will find several options for contacting support in the provided link.