Along with my Videocon TV, I purchased Videocon d2h also. That is the mistake I did. My first problem was whenever I switch on my TV, , it says smart card not authenticated, please wait 30 seconds and try again. When I called customercare they suggested me to remove the smart card and plug it again.
This went for few months. Luckily now that problem is reduced. Second problem, Suddenly volume doesnt work. I have to forcibly switch off my d2h box and start it again. This is again an irritating problem..