I have 3 pro, VMS4340P. All of a sudden 2 are offline. Changed batteries , arlo base blue

[cdkin37]

. All of a sudden 2 are offline. Changed batteries , arlo base blue

[jguerdat]

Reboot the hub. Do the cameras appear offline when using the web client on a computer browser (my.arlo.com)?

[cdkin37]

I did shut down modem, has blue light, but only have 1 camera out of three that is not "offline". I do not understand how 2 are "offline"

[jguerdat]

What happens if you bring a camera closer to your hub?

[78rm400c]

I have the same issue with 1 camera and am trying to figure it out as well. I am away from the house for a while so it is a problem for me. 
Something I had planned to do was to factory reset the camera once I’m home.

Give that a try and post if it worked.   Thanks