HA2NON That is very strange, as nothing has changed at the server as they are unable to do anything with the network services to improve QOS. All I can tell you is that between the stable V61 and the Beta V63, there is a difference between how the 2 devices are operating, so something has changed in the new firmware.
The OS4 that is running V61 still has a very high packet (>15%) loss and is unintelligible and the OS4 with V63 Beta is usable and has packet losses with less than 10% - typically around 3% to 5% and the audio is intelligible, so something has changed. The only issue with V63 beta is that that the packet losses are not stable and inconsistent. I assure you that It is not with our network that has changed since both devices are on the same network and both devices running different firmware version behave differently.