I have a similar problem started a couple of days ago after downloading the newest firmware and software. I thought it was due to changing from a B to a G router but after reading this thread it seems it may be down to the new firmware. My problem is that when depressing a button for a device conrolled by my Netx's the remote icon topleft of screen shows that the Ipronto is sending a signal for up to 10 seconds, upon checking the Netx the light on top is permanently green so sending a signal to my devices. This is then followed by a period where nothing works and then suddenly all is fine again.
Can anybody help me, I have 2 Ipronto's and 2 NetX all of which are affected.