Shift Cable adjustment?

My display sometimes changes from H to — in the middle of riding. A very light pull back on the shifter brings back the H (2013 800 50").

I’m guessing my cable is stretched a tad.

What’s the "ratcheting" the manual talks about if the cable is out of adjustment? What’s that sound like? I am getting a sound on decel in the last 15 feet before coming to a stop. It’s more like a repetitive chirping. Could that be the transmission "ratcheting" from not having the right cable adjustment?

The manual is not particularly clear on this subject. The only two clues I have are the — , and the chirping noise on decel.

Any ideas for me? Thanks for giving it a thought.