Wipers are messing about

[micaerin]

Whilst driving to work this morning I sprayed my windscreen and it washed as normal then I moved wiper stalk up to just wipe the left over water and nothing happened, so I moved it up one more to continuous and still nothing, all the way up to fast and nothing again. I moved stalk to down for 1 wipe and it worked?  Playing about trying to get it to work it will wipe now and again, have you guys had a similar problem, or any ideas?
Thanks in advance