Floating MCLR?
LVP is OFF?
Noisy PSU?
Poor contact, low battery, are some other great tests..
You could also begin your program with something like...
Code:START: HSEROUT ["1,2,1,2 TESTING....",13,10] FOR MyVAR=0 TO 250 HSEROUT ["MyVAR=",#MyVAR,13,10] NEXT GOTO START


default config line is...


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