CLICK HERE for the 332C manual if you do not have it.
It has been my experience that if not married properly - the transducer and cable can become breached - and water enters the connection and starts the corrosion process.
Have a good search for the transducer.
If you have a trolling motor installed - look down near the prop - 
some even have them built -in! You'll have to trace down the wire when its on the trailer out of the water.
Sometimes a sensitivity adjustment can be made and it will solve the problem.
Many times there will be an object - like glass or metal that will deflect the sonar and make it act up.
If you are getting it only occasionally - i would suspect debris on the bottom - if the range is out consistently - the transducer is at fault. There are many places to mount it - so tracking it down will fall on your shoulders :D
Your 332C can only translate the info it gets from the transducer - so you're on the right track. Locating it, and testing the connection and wires is the next step. If you cannot locate it - you may just opt to purchasing another - and mounting it yourself to save the labor cost of someone else doing it - and you'll be problem-free for quite a while.
Thanks for using FixYa!!
From page 84 of your manual:
Automatic Sensitivity
The default sensitivity mode is automatic. The unit bases the sensitivity
level on water depth and conditions. When the unit is in the automatic
mode, sensitivity is automatically adjusted to keep a solid bottom
signal displayed, plus a little more power. This gives it the capability to
show fish and other detail.
However, situations occur when it becomes necessary to increase or decrease
the sensitivity. This typically happens when you wish to see
more detail, so an increase in sensitivity is indicated. Or, wave action
and boat wakes can create enough tiny air bubbles to clutter much of
the water column. In that case, a decrease in sensitivity is indicated to
reduce some of the clutter.
The control bar used to adjust sensitivity up or down is the same
whether the unit is in the automatic or manual mode. In automatic you
can adjust sensitivity up to 100 percent but the unit will limit your
minimum setting. In auto, the unit will continue to make small adjustments,
allowing for the setting you selected.
In manual mode, you have complete control over sensitivity, with the
ability to set it anywhere from zero to 100 percent. Once you select a
level in manual, the unit will continue to use that exact sensitivity setting
until you change it or revert to auto mode.
ADJUSTING THE SENSITIVITY starts on page 85.
I'd go for the easily accessible rear skimmer installation called a Transom Mount.
CLICK HERE for the types that are available.
CLICK HERE for a page with a few good Garmin Transducers with different mount styles and applications - the most expensive of which is $119.
Most are interchangeable (industry standard) - just make sure the plug matches your 332C - or find an adapter.
eBay may be a good place for you to start looking. Often good used ones can be found there pretty cheap.
Good luck!!
Thanks for using FixYa!!
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THANKS FOR THE INFO. I THINK I WILL CALL THE INSTALLER AND SEE WHAT THEY SUGGEST. I AM QUITE SURE THE UNIT IS FINE. I HAVE A NEW 135X UP ON THR TROLLING MOTOR AND WORKS GREAT. IF I FIND OUT IT IS IN THE HULL, SHOULD I RECOMMEND REPLACING IT WITH A SKIMMER JUST OFF THE BACK OF THE BOAT? HAVE ANY IDEA WHAT THE COST OF A NEW TRANSDUCER WILL COST? i HAVE LOOKED TONS BUT BUT FOUND NO LISTING FOR A 332C SPECIFICALLY.
THANKS,
ANDY
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