My 2920 is resetting the wan1 port every 24 hours approx. I just presumed it was the 02 modem going down as wan2 stays connected until virgin wobble.
Anyway this started causing problems with one the strikestar servers which I couldn't reconnect too. Strike star are lightening monitoring network by the way.
Switching the 02 modem to my 2820, the 120 wouldn't work with the 2920 solved the sytikestar problems but it was then I noticed the up time showed no disconnection at all on the 2820.
Any ideas??

Have you tired Telnetting in and stting ip arp accept 1 - as per: http://www.draytek.co.uk/support/kb_vigor100_setup.html ?

Well I haven't as the router isn't even showing a connection with the 120
Back to the ordinal question why is lan1 dropping the connection to any device on wan1?