It seems there was a sound transmission issue with the stage at Coachella with Taemin.

Just as the performance was reaching its climax, an accident occurred involving sudden silence and noise.

I saw in the article that it was about 8 seconds.

Truly perfect vocals... it was a performance at its peak, but it's a shame that this dampened the mood a little.

Even so, Taemin finished it off professionally and wonderfully without letting it bother him.