> I eventually leave this loop, but after significantly more than
> 6 cycles.

How are you figuring it's more than 6 ? By measuring time ? Are
you sure the 500ms delay is correct ?

Have you tried running and monitoring it in MPLAB ? (with and
without the delay500 enabled)

Is  the RAM byte "Counter" being used in another part of the
program under a different name ? For example, have you
managed to assign the same address to two names ?

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