Sounds like you have done some good troubleshooting ..... In addition to what Rickie suggested, I'd give Humminbird a call and see what they have to say. I have been seeing a lot of networking glitches reported on the various forums lately. A lot of them seem to be when I-pilot link is one of the variables.
Maybe consider mounting your other HDSI transducer on the trolling motor so you don't have to share the imaging.
_______________________________________
Looking for the one that makes it all worthwhile.
Thanks Bob, I have been considering mounting the HD SI xducer on the Ulterra, I currently have it mounted on my Terrova and did not have these problems when using the Terrova with i-pilot link, but installed i-pilot link on my ulterra, re-installed the Ulterra on the boat and upgraded software versions on my Helix's at the same time, so it may be just US2 related. Have to think about how I really want to do the install though cause I really don't want to add more stuff to the front of the boat.
Xpress H20PFC with 150 Vmax SHO
Ulterra I-pilot Link networked with Helix 10 SI Bow and Dash
SpyderLock's on the front and Tite-Lok's on the back
Creekslick Rod Holders and Millennium seats for Summer