Loud Static/White Noise during group call pickup

My team uses the Polycom CCX700 series phones with the group call pickup feature in order to pick up each other's calls.  What we are finding is that these phones will intermittently give out a momentary burst of white noise/static (while the alert tone is playing) whenever calls come in for other members of your GCP group.  Getting this recorded is nearly impossible because it is so intermittent. Has anyone else noticed this behavior?