ASUS-VivoBook-15-X505BA recently started making a whistling/wind up type noise with a clicking sound right afterwards - pretty quiet though and usually when I am working on stuff, loading web browser, etc. Sound is coming from the top right of keyboard. Laptop is maybe 3 years old.
Laptop, overall, feels like it is slowing down so not sure if that is due to this or just general use/age. Also, I have Carbonite backup (and have had) just in case anything happens.