Timer Countdown Resetting automatically

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C#

ASP.NET4

I have used a timer in my webapp and it is working fine with the functionality. But my problem is the timer is getting reset-ted automatically when I it is deployed in the server. Ex: If the time is set to 70 mins, At some point it like 45min - 40min time gap it is getting reset-ted. Here is the code which I have used for this.

if (Convert.ToInt32(Session["minute"]) == 0 && Convert.ToInt32(Session["seconds"]) == 0)
        {
            // Your code 
        }
        else
        {
            if (Convert.ToInt32(Session["seconds"]) < 1)
            {
                Session["seconds"] = 59;
                if (Convert.ToInt32(Session["minute"]) != 0)
                    Session["minute"] = Convert.ToInt32(Session["minute"]) - 1;
            }
            else
                Session["seconds"] = Convert.ToInt32(Session["seconds"]) - 1;
            string mins = "", sec = "";
            if (Convert.ToInt32(Session["minute"]) <= 9)
                mins = "0" + Session["minute"].ToString();
            else
                mins = Session["minute"].ToString();
            if (Convert.ToInt32(Session["seconds"]) <= 9)
                sec = "0" + Session["seconds"].ToString();
            else
                sec = Session["seconds"].ToString();
            lblTimer.Text = "Time Left : " + mins + " : " + sec;
        }