Noise from windscreen wiper

• Wonder if anyone else has had noise problems with the wiper motor?
• It  has appeared after a couple of weeks from new .   I was not aware in first weeks In fact was impressed with the lack of noise initally
•  
• It sounds like a loud woosh when the wipers return to the bottom of its programme,  more so when the delay feature is used.

Any ideas as to what might be the problem, would appreciate any suggestions (useful that is)

Jake