Jaume Aragay Badia wrote:
> 
> > Mosfets are perfectly good relay drivers in general. I can't tell wether
> > you want them to be immune from noise, or you think that they create
> > noise??  There is an impulse when you turn off the relay coil, but you can
> > handle that in hardware, either with a snubber, or by turning the FET off
> > slowly. It's the attempt to instantaneously stop the current through an
> > inductor that gets you into trouble there.
> 
> Dave, I ask about using the FET INSTEAD of the relay, not to drive it.

Other PIClisters as well as myself have suggested a loads 
of solutions to problems we don't know exist. 
1) Have you looked at the 5V rail on a scope?
   Is it smooth, or noisy?
2) Have you looked at MCLR on a scope?
   Is it solid 5V, or is it also noisy?
3) Have you looked at OSCO on a scope?
   Is it running smoothly?
   Are you using the correct XTAL fuse setting?

Answer these questions, and we can solve your problem pronto.

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