Images does'nt display after few hours of Auto Refresh.

Question

Hi All,

         I have a webpage (ASP.net, C# ), with some images of traffic lights, based on some condition from table , if value =0, i display Red image, if value = 1 , i display Orange image and if value = 2 , i display Green image, by codebehind . I am refreshing the webpage each 1 minute to fetch the new value using timer. The problem is that this refresh works fine for some 5-6 hours after that i don't get any image displayed. I dont think timer will stop after these hours. Any Ideas..

Thanks 

Vish