I am also in the Al-Thumama area and my internet would stop working randomly and Mozaic streaming was not smooth with a lot of lag. I had to complain thrice and then a QTel exchange person called and told me that there was some configuration issue at the exchange.

Before I had to restart all devices after every hour or two but now its been 2 weeks and everything is working without any problem. I say you call QTel support and tell them that you want to talk to someone in exchange. Lets hope they sort it out for you.