AirParrot from PC to AppleTv lagging sound

Need help!!! I&having trouble with sound (you can here it as if the sound stops for a 0,5sec. each 10/15 seconds) while using "media streaming" (NOT MIRRORING) from PC to AppleTV3 via AirParrot - I&playing an 4gig mkv file. Tried a small mkv - same shit. My specs: Intel(R)Core i3-4005U @ 1.70GHz, 4GB, Windows7 x64, Router - TP-Link TL-WR841ND working in 11bgn at 40MHz/auto. In other modes as mirroring sound does not lag, as well as in mode "audio only". Also I tried to use a program PopCast and films play smooth without sound issues. So i suppose it¬ the issue with wi-fi. Any ideas guys?! Thanks