Will-could be nothing.......but I've had bouts with Afib and keep charts on my spikes when I see them and take the info with me on my doctor's visits. It could be the equipment-or it could be some abnormalities. Right now the fact is none of us knows for sure do we. Next time you see something similar try the pulse test to see what you get and maybe that will help provide better information. This is a situation you need to make sure you're dealing with the facts and not conjecture. If it were me I'd not be alarmed but treat it seriously until I could rule out Afib issues.