Very choppy sound on t5570e Thin client

Hello dear HP support forum and forum gurus.
Our company bought approx 3 000 Thin Clients (t5570e) for a big organization in our country. The problem we encountered is associated with sound.
Every thin client connects to a Terminal Server /WinServer 2008R2/ via RDP (port:3389). Every RDServer configured identically.
Let’s take one site (biggest one) with 6 RDServers and 800-850 users. The strange things happens!!! On some RDServers (ok RDServrs hostnames: TS1, TS4, TS5) users can view videos on YouTube with perfect sound, but the same user on another RDServer of the same RDfarm can view YouTube video but with very choppy sound (not ok RDServrs hostnames: TS2, TS3, TS6).
I mentioned when user starts its RDP session and when RD Connection Broker redirected that user to ok RDServers HP Velocity tray icon on Thin Client became green. But when RD Connection Broker redirected that user to not ok RDServers, HP Velocity tray icon on Thin Client remains blue. Anyway, at a moment when I mentioned this behavior of HP Velocity tray icon on Thin Client, HP Velocity Server Side applications weren’t installed on any RDServer.
A few weeks ago I installed HP Velocity Server Side x64 on all RDServers. Now I see HP Velocity Tray Icon on my RDServer. I can even view IP Addresses of a thin clients that redirected to a RDServer. But the problem remains.
Now, when RD Connection Broker redirected a user to not ok RDServer, HP Velocity tray Icon became green but even after installing Server Side App, sound remains very choppy.
Please help me understand what the problem is?
Regards

Hi @vdadashzadeh ,
Welcome to the HP Support Forums! To get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at http://h30499.www3.hp.com/hpeb/
I hope this helps!
Best,
Russ
I worked for HP.

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