I’m not sure if this has been discussed hear- sounds familiar. I started having trouble with the spot lock shutting off when it turned back 180 degrees . Brought it in to be worked on and the mechanic couldn’t find any problems- the typical culprits like switch and something in the pedal had already been upgraded and looked good. He called the factory and they suggested it could be the lithiums if they were a “cheaper “ brand ( something about the BMS reading voltage)- I had recently swapped out my li-time from my other boat (no ultrex)to get me through the season until spring when I would buy more for my bigger boat . Time to buy for the big boat so I went EPOCH this time- problem fixed. Sounds weird that it was the batteries but apparently it was. Just something to think about when buying batteries . I’m sure some will say they didn’t have that problem - just saying that’s what happened to me