IMT350W Internet Problems

[ewood]

I have three Proliphix IMT350W. They keep disconnecting from the internet. I originally had all three connected to a wireless router. One did not have good connectivity so I added an Apple Airport extreme. Now I have two going thru the Airport Extreme and one thru the old wireless router. All three of them disconnect from the internet at different times. I contacted Proliphix, they said it is probably a conflict somewhere with the Airport Extreme. Does anyone have any ideas? Thanks!!