I have a LCX 26cHD and a LCX28cHD that share a gps puck.
The 26 has an intermittent problem that occurs usually when i'm zooming in or out on the gps screen. It will freeze up and turn off, then try to re boot but it takes a very long time(10min to an hour) to turn back on. During this time the screen will show the "26hd" logo. The front unit(28) has no problems during this time.