Difficult to guess at a fault like this. Could be anything from a switch, control module,wiper motor or wiring.System needs to be tested.

try wiggling the lever forward and back
and up and down a little
when they are stuck and see if they start again.
mine did similar..
cheers
liam

ps from memory , on my peugeot 106, I think I had to push them forward a tiny bit to get them going again.
if so it's probably the switch? , I took mine apart and cleaned them..they've lasted 3 years so far, no probs

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Edited by liammcl on 30/04/2018 at 03:25