also: おとずれ
noun
audio lag; out-of-sync sound
Refers to a situation where the audio is not synchronized with the video, such as in a movie or game. Common in technical and everyday contexts.
この動画は音ズレがひどくて見ていられない。
This video has terrible audio lag and is unwatchable.
テレビの音ズレを直す方法を教えてください。
Please tell me how to fix the audio sync issue on the TV.
同期 means synchronization; 音ズレ is the lack of it.
Compound of 音 (おと, 'sound') and ズレ (ずれ, 'gap, misalignment'), from the verb ずれる ('to slip, to be off').