The Dark Phoenix (2): The Inner Circle - S3-E12
Audio problem: When Beast jumps off the balcony, the sound when he lands is similar to how it would sound if he was wearing shoes or boots, but he is barefoot. (00:19:00)
The Dark Phoenix (2): The Inner Circle - S3-E12
Audio problem: When Wyngarde says "For new sensations, my love," his mouth is closed for most of the line. (00:12:50)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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