IIS crashes sometimes. ASP.net Application on IIS 6 Win 2003

I have this ASP.net application running on IIS 6 on Win 2003. I am often faced with iis crash in the range of every few minutes.

The app restarts frequently and loses all session information.

The event viewer shows below:

EventType clr20r3, P1 w3wp.exe, P2 6.0.3790.3959, P3 45d6968e, P4 app_code.soku_afh, P5 0.0.0.0, P6 4a12f739, P7 2f6, P8 30, P9 exception, P10 NIL.

Any pointers on how to solve this.