Bought less than a year ago and it really never has worked correctly for an extended period of time. I’ve checked it over and over and can’t seem to find anything wrong with it. I put it in, let it sink. Turn it on.. it lights up, moves two feet forward and then two foot back then shuts off. I have a feeling the impeller is not spinning while under water, but it does spin freely by hand. Anyone have a similar problem? Thanks