The Phoenix Saga (5): Child of Light - S3-E7
Audio problem: Storm's mouth is completely closed when she says "The immediate threat to New York City has been averted." (00:12:10)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Audio problem: When Lilandra's advisor is saying "The X-Men face hopeless odds," his mouth is closed for the word "face." (00:08:57)
Dark Phoenix (1): Dazzled - S3-E11
Audio problem: When the White Queen says "She's asleep," her mouth is closed for the first word. (00:12:39)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: When Kazar is saying "That should hold him for a while" after trapping the T-rex in the pit, his mouth isn't moving. (00:14:46)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: When Sauron is saying "Cowards, fools, come back," his mouth isn't moving. (00:02:02)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Audio problem: When Lilandra is saying "No, for the sake of the universe, no," her mouth movement is not in sync for some of the dialogue. (00:18:23)
The Phoenix Saga (4): The Starjammers - S3-E6
Audio problem: When D'Ken is ordering Gladiator to identify himself, he is speaking in a voice that sounds more like Dr. Corbeau from a few episodes earlier than it does D'Ken. (00:09:20)
Mojovision - S2-E11
Audio problem: When Magneto is saying "the creature attacking the woman," his mouth only moves for the first two words. (00:20:23)
Mojovision - S2-E11
Audio problem: When Mojo is saying "Control room, what are you doing up there?", he doesn't press his lips together at the end of the word "room" in order to pronounce the M sound. Instead, he is shown clenching his teeth together. (00:17:19)
Audio problem: When Jean Grey exclaims "No!" after Ms. Marvel says "This ends now," she is speaking in Ms. Marvel's voice. (00:18:59)
Mojovision - S2-E11
Audio problem: When Mojo is twirling around in a circle and saying "Am I standing?" to Major Domo, you can see his mouth is wide open for the entire line. (00:04:10)
'Til Death Do Us Part: Part 1 - S2-E1
Audio problem: When the Friends of Humanity are approaching the mutant that looks like a werewolf, they are saying "No more mutants," and none of them are pressing their lips together to produce the "M" sounds when saying "more" and "mutants." (00:08:37)
Days of Future Past: Part 1 - S1-E11
Audio problem: When Bishop is saying "They treat the rest of us just fine," his mouth is not moving for the last two words. (00:04:53)
Audio problem: When Cyclops shoots an optic blast at War's feet during the battle at Stone Henge, the groan that War lets out is the same sound used whenever Wolverine's groans. (00:18:24)
Night of the Sentinels: Part 2 - S1-E2
Audio problem: When the tower guard is saying "Put me down, you flying freak," his mouth is not moving. (00:06:54)
Night of the Sentinels: Part 1 - S1-E1
Audio problem: When Cyclops is saying "Okay Storm, do your thing," his mouth movement does not match the dialogue. (00:18:31)
Audio problem: When Beast is saying "If anything happens to her," his mouth is wide open for the last three words. (00:13:15)
Audio problem: When Magneto is saying "Strange. What would restore your...," his mouth remains wide open and unmoved after saying "restore," which would make it impossible to then say "your." (00:19:45)
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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