We had the same problem on R10LE with XD5.5 and only after a correct upgrade from XD5 to XD5.5 (uninstall & install instead of upgrade of the Virtual Desktop Agent). Problem only occured when audio was redirected to the R10. Disconnects happen at random times. Problem did not occur before when upgraded to XD5.5 the wrong way. Problem doesn’t occur when using a Z90D7 or Windows/Linux PC.
Problem seems to be resolved by using on older firmware (was 7.1.033, now 7.0.218) on R10. 🙄