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Look in settings. There are multiple pop ups and recommendations that can be disabled.
Just turn them all off.
As the exact options vary by STB, I can't say for sure on the exact one you are refering to.
But they are quite obvious by title.
What STB do you have and when exactly does it happen?
VMS4100 and IPC4100. it happens about 10-15 before a show ends. The closing credit will start, but the show is still going. On Hulu and other streaming sites, you'll get a 'next" pop up when the credits start. Fios just screwed up and put the "more like this" too early.