Wiper and water sprinkle intermittance malfunction

[willphang]

Anyone had encountered this problem before? Was driving in a rain with wiper in function (at the lowest speed for 10-20 minutes continuously) and suddenly it stopped working. Try at other speed level and water sprinkler system as well - all futile... was force to continue drived dangerously at slow speed in the rain for about 5 minutes and it wiper suddenly working again. Had encountered this weired condition twice (recently) so far and I just wondering has it got to do with any electronic relay failure etc. FYI my UDM came with rain sensor windscreen.