Vertical dotted lines coming in a Vocal Track

I’m hearing a faint but unmissable tff, tff tff sound, on a vocal track, almost digital clicking, and it is random. I think it is related to some random VERTICAL dotted lines appearing on the track. Seems to be from the inputting into my Focusrite 18i8 to the pc/recording. Tried several mics, same ticking!

Hi and welcome,

Could you please attach an example sound?

Sorry, it’s disappeared! Come back if it re-appears!!!