VIBEX noise audible noise

Today I got an answer of VIBEX , I wrote them about the problem , I could send the unit to Spain to have inspect it .In the meantime I got a Russ 
Andrews Silencer ( parallel filter ) that works great , unit dead quiet, told this result , and within an hour I got this answer :That's great news . I'm pleased to hear that Russ harmonic filter works fine , he is a friend of mine.There are no active or passive components either in the Vibex power block . Noise reduction is achieved by using mechanical energy absorption techniques and screening elastomers.OK great customer service .But only one question for me , what causes the noise , elastomers getting hard ?

Asked VIBEX.ES , the factory , hope I get an answer , but already know
no serviceable parts inside , all 3 are the older models.

Im using 2 VIBEX Platinum units they look and sound great.Hope yours is ok it may need service.Let us know what is wrong.I had the older versions these are much better.Good luck.