Airdroid freeze connection?

Hi, i've tried using Airdroid a couple of times but it always let me down. I acess via IP but lets say i open messages, videos, etc and then it stops to respond, keeps on loading... after 1 minute or so if i press again another folder or whatever it works again till it stops and so on...
Why's this happening?

try to search in the wi fi settings if some sttings like " turn off wi fi ehwn screen is locked" are on.. sry for english!

yep, i've already checked that and it's not the problem... it's something else