shifter problems

Having problems with the electronic shifter on my 2013 R27 Tug. Problem is occasional. The boat won't go into gear after starting the engine. We have had a professional look at it and he can't find anything wrong. This has happened to us once or twice a season. Concerned about getting stuck somewhere. The boat stays in neutral.
The motor starts fine but the boat won't shift into gear. Has anyone else had this problem and/or suggestions as to where to look.

HI I have had the same problem and I think it is the solenoid for either forward or the solenoid for reverse. I had a bilge pump stop working and salt water sprayed on the electrical connections which made me drop out of forward. a new solenoid ($800) and new connections seem to have fixed this. oh and I replaced my bilge pump
boater joe
Flying Turtle
R29-S
Bainbridge Island, WA

thanks for the feedback. Bucket list. D-E adventure.