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I had the same problem ( the freeze ) on start up. I previously had a 987C installed and just used the 987 's power hook up. After a couple trips of putting up with this I installed the 997's power cord and the problem disappeared. Only difference I can see is the " ball " on the 997 cord. Also eliminated a slight interference problem.
Garminarmin gpsmap 1040 xs networked with Garmin gpsmap 1242 xsv , Panoptix PS 30 and PS 31. Livescope LVS 32
Ice rig Echomap Ultra 106SV with LVS 12 and GT10-IF