I've contact garmin a few times about this -- they tell me it's "normal" or
"growth on the transducer" etc.

sometimes, depth stops being reported/read (flashes) -- powering the unit on/off
does nothing -- switching from dual beam to dual frequency (or narrow to wide or
50 to 200mhz) does nothing. Speed is irrelevant. it's still getting a signal
from the tranducer because if I unplug it; it says "tranducer unplugged" .

sometimes it stops reporting for only a few minutes, other times for hours.

What's a best guess on this? Bad sounder or bad tranducer? one is easier to
replace than the other, one costs more than the other -- so for me -- it's about
a wash as to what I replace 1st. Both units are less than a year old...

Thanks for your thoughts.

-josh