There is a serious game ending glitch in Frogger, that surprisingly calls to the Intellivision’s cheering sound effect bank, with the problem with it never returning (Game Terminates). There does not seem to be any definite reason why this occurs, but the further the game goes, more likely the glitch to occur at any time. Can happen at any part, road, middle, river, etc… (there are several examples in the this week Intellivision HSC ending tonight for examples if needed).
Source Links:
atariage.com/forums/topic/320933-intellivision-game-glitches/