E39 wiper problem

Dear All,
Re: 1997 E39 2.8i touring
Over the last few months has developed an intermittent wiper fault - they work fine unitl they judder a bit and STOP and will not re-start for quite
some time - 30mins to 1 day ...
The front washers also dont work when the wipers have failed - the rear wipers mostly work throughout.
The local garage had a look at the motor and wiring recently but couldn't find anything amiss - though this did cure it for a week which saved us during some VERY heavy rain . I imagine they disturbed a broken/breaking wire or the plug has a dodgy pin? The wipers stopped again last night ...
Any ideas all? What normally 'goes' on these at 125,000miles to make the wipers pack up ... now and again (grrr ...)
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