> Because of the frequency of occurrence

How often does the motor get switched ? Can you do many
starts to eliminate that as a cause ? Is the relay on the same
Vcc as the PIC ?

It seems to me there are two suspects - the power supply and
the sensors

You know that the present set-up hangs, so add two more PICs
with identical code. One is run off a separate clean supply (ie
a battery) with sensors, the other is run on the mains supply with
no sensors. If either of them hang then that may give you a clue

It sounds as though the sensor **may** not be the problem if it's
PIC-driven and PIC-received. So disconnect the sensor and
see what happens

Short of that I can't think of anything else except logging

> Unfortunately, it is not! This is a pilot installation, many more
> would be hopefully made once I sort out the issue!

Ooooh, bugger

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