e127 Fishfinder No Transducer Connected

[Dave Frye]

I have an e127 with a B744VL transducer connected. It is a two year old installation software ver 17.45. It worked well for almost two years and then became intermittent.
Now it will not stay on reporting depth.
When it is started a "No Transducer Selected" message comes up. I press the select transducer button but the unit does nothing when B744VL in selected.
When I reset the sounder the unit begins scrolling and correctly finds the depth. This lasts just long enough for me to select the B744VL transducer. The unit works properly for about 15 seconds and then a message comes up " No Transducer Connected. Connect a Transducer and restart the unit". This is very repeatable.
I have verified the cables are in good shape. I have used contact cleaner on the connectors for the transition connector cable between the B744VL and the e127. Using a magnifying glass the connectors look to be in great shape.
The Speed and Temperature functions have never worked on the B744VL even when it was on the old RL80C Plus.
Thank you,
Dave Frye