Hi Ernst, thanks for your reply.
Well, we are mac here so don't know about extra network cards...sounds pc to me ha! Anyway, the point is it was fine but now with the Netgear 3700 something changed. The Z3100 is always on and wakes it'self up now and again for maintenance as per usual but when on the network (3700) it eventually just has no info (blank) on the Z3100 LCD. Strange but it still responds as normal (not frozen) and we can print ect over the network and also shut it down and restart at the printer.
Not sure about Kaelaria's suggestions but 'have' tried a static ip address but same problem. As stated, Netgear is no help...it's a bit unusual for them I think!
Sorry I can't help with your problems Ernst although I think I am still running the previous firmware on the Netgear 3700 as on forums lots were having problems with the latest. In fact after making a backup, I tried the latest firmware but it caused all sorts of problems and after over 2 hours on the phone with Netgear just gave up and loaded the backup/settings! Maybe try the previous firware (but make a backup first!!!ha!)
Evom