Noise Windscreen wiper

Had recently found a completely new source of noise – lighter rain – so rain sensor and every time the wiper reached the dead point a metal noise not loud but audible – and as of miraculously the next day everything was in order again! a second phono I could also notice, if I in the city at approx., 1200 -1400rpm with inserted passage to the traffic light roll the car is somehow different regarding noise louder and somehow unpleasant as soon as disembarkation Pelt is getting this noise away. has made any of you already similar experiences!!! bearded