that's really strange... i use this PIC since many times and never see that problem but can you confirm those...- Is your supply line clean and properly filtered (0.1uF close to your PIC)?
- If on a bread-board and you use crystal, did you try to remove those capacitor around the crystal?
looks more an hardware problem. Unsufficient supply line filtering, VCC drop when you have too many load on PORTB OR your total current on a PORT exceed the maximum rating of the PIC.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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