Audio.PlayOneShot making a weird popping noise

Hello. So I have a function that basically just plays a random, short one shot audio clip from an array of four when a GameObject hits a collider, but the sounds start making a popping/clipping noise at the end after playing for a while. There shouldn't be any clipping within the sounds themselves. The 'pop' is always distinctly at the end of the audio clip. Is there any common cause for this?

Thanks.