I was having this issue in another thread, and we figured out that it was because I have the Seasons option set to “hide” for my TV library.

If you change this to “Show,” you have to do the following:
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Make sure the library is set to “Show”
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Make sure the individual shows within the library are set to “Show” (changing the library does NOT change all the shows – You have to edit the show and the option is under “Advanced”)

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Delete all your downloads and start clean
When I did all of this, my shows stopped the infinite cycling. Apparently this was a bug in the past that they thought they had fixed, so they’re readdressing it.