There is no agreement between China Unicom and Tencent don't speculate like that. If you actually used pidgin on the desktop to connect QQ you would know it has the same problems. What you need to do is when you get disconnected is to REACTIVATE your account. Go to the link your IM program gives you; login with your QQ details. When it asks to change your pw click skip. While you're on that Safety page, you might as well apply for a higher security level by providing more information. e.g. choosing secret questions; filling in an old friend's QQ no.; maybe even register your mobile no. Also apply for a secret password matrix card. Fill as much as you can. You'll probably increase your chance of staying connected. Once you get those capchas its ovwr cause those are useless with pidgin.