Capaction - 2012-09-15

My program run well on a PIC18F1220 but often after more or less 30 minutes it STOPs running.
I swicth off the power a few seconds , and switch on. Then the programm run again.
The config in GCB is:
#Config LVP=OFF, MCLRE=Off, PWRT=On, WDT=off, BOR=Off, OSC=INT, CP0 = On, CP1 = On, CPD = On,CPB = On

What is it ? some kind of overflow not handled by GCB, refuse of a normal loop when the running speed is stabilized, ….

I am puzzled !  Thank you for your suggestions