We have an issue with a customer running VoWLAN. The solution is deployed in a large warehouse facility with roughly 12 AP's covering a 60000ft facility. The voice quality will be fine for about 30 mins and the will start degrading to the point that the phone de-registers from the CME. About 2-3 mins later it returns to normal. The AP's in the warehouse are using 2.2dbi rubber duck antennae and are spaced roughly 30meters apart in a 2 , 1 configration across the floor. Non-overlapping channels have been used and the power level of 3 has been selected on the WLC. The strange things is that if I have a PC and a laptop configured and associated to the same AP, and I run a ping to both of these devices, the laptop responds 100% but the phone looses 2 - 3 packets intermittently. WCS was recently installed and is revealing de-auth attacks. Not sure where these are coming from, and if these would cause this type of intermittent disconnect and problems on the WLAN. see attached doc.
any advice would be appreciated.