Minn Kota Ulterra acting funny

[70diesel]

Not sure if this is the correct forum but my Ulterra is intermittently acting up. Sometimes when I deploy the motor and start the prop, the remote says it’s spinning but it isn’t. Same issue will happen with the foot control. I can still steer but the prop isn’t turning. I have to stow and deploy a few times then it will work fine. Sometimes the prop will spin on the first try but not the second and I futz around with it until it begins spinning.  It always deploys and stows fine. My batteries (80lb thrust, 24v) are only 1.5 years old. I can’t replicate the issue and so far it has solved itself. Oddly it only happens during the initial time I put the boat in the water and once working, it’s fine all day.  I called Minn Kota and they had some ideas but they’re beyond my mechanical abilities. Anyone else have this issue or can anyone provide some ideas? 

[looking45]

If it's under warranty, call/take it to an authorized Minnkota repair shop. A call to the shop might get you the answer/fix you need. 

[OperationEagle]

These ulterra’s are super sensitive to low voltage. Check out your batteries to make sure they are at their max.  Any drop in voltage makes them glitch.

[70diesel]

It’s not under warranty anymore so that’s not an option. The batteries are AGM Cabelas and are only 1 year old. But you’re correct about voltage, that’s one of the things Minn Kota said to check. I bought an external battery/voltage monitor to check for that. Weird part is I always charge the batteries each time I use the boat with a good charger but that doesn’t mean one of the batteries isn’t going bad.