Sonar piezoes vibrate to create the sound pulse ...
Vibration is mechanical energy ...
Mechanical energy will wear anything over time ...including piezoes ...
There have been many reports thru the SI years of xducers getting weaker and replacing improving the images ...
There are other variables needed to consider also ...
Head unit issues, cabling issues, EFI/RFI creation from other electrical deviices over time, software updates ... can all contribute to differences in what one compares to "it didn't use to look like this" ...
The best troubleshooting method for suspected xducer failure (or weakening) is testing with a known good/new xducer ...
Rickie


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