If you enter death replay and it begins in the middle of Kelvin's Arctic Beam and back out of the replay before it finishes, the audio for Arctic Beam persists for the rest of the match.
It could very well be that it's just backing out of the death replay before a channeled ability is finished (not necessarily beginning the replay during one) that causes the problem but the above is what happened to me.
It could very well be that it's just backing out of the death replay before a channeled ability is finished (not necessarily beginning the replay during one) that causes the problem but the above is what happened to me.