iTunes Forgets Selections

I have iTunes 12.3.2.35 on OS X 10.9.5. Recently, it stopped remembering my selections. I'll deselect some TV episodes, then a few days later, those episodes will be reselected. No matter what I do, eventually, all TV episodes and movies end up being selected. iTunes does remember my music selections. Is there anything I can do to get my selections to persist?