Wiper timing issue

[German68]

Evening folks,

Any advice or thoughts would be appreciated ...

I have a 1.4 petrol multispace (56 plate). As of yesterday, I have had wiper timing problems.

Flick wiper stock down for a quick wipe and the wipers go maybe 5-6 times then stop in the middle of the windscreen (slightly different place each time).

Flick wiper stock to "intermittent" and the wipers go on a "normal" time pattern for a while (maybe 10-12 wipes) then stop in the middle of the windscreen (slightly different place each time)

Flick the wiper stock to "normal" and the wipers kind of play nice for a while but eventually stop in the middle of the windscreen (slightly different place each time) !!!!

Flick the wiper stock to "fast" and everything seems ok !?!

Flcik the wiper stock to "off" and they don't go off until it suits (again 10-12 wipes but variable) ...every now and then the do stop in the correct place.

Moving or stationary does not appear to make a difference.

Tried a couple of BSI type resets:
1 - removing the shunt fuse in the passenger fuse compartment for an hour or so.

2 - window down, battery disconnect, battery reconnect, side lights first etc ....

Both have had mixed results - couple of times the wiper timing has returned to what it should be but then gone again next time the engine has been started.

Any thoughts ?

Using a cheap OBD scanner doesn't show anything ...would a main dealer diagnostics give any more information ?

Many thanks
Graham

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ps - is a com2000 reset procedure different from the BSI & is that worth a try ?

Sorry if that is a daft question !