Tingling in the wrist and fingertips without the obvious causes -> That is not normal, and could be a symptom of something very serious. My dad who is on a dozen medications, says he feels hand numbness when a heart attack is coming on.
Before we start dispensing medical advice, you should do more testing to narrow it down, and eliminate false positives.
You should keep a journal of each occurrence and talk it over with a doctor.
does it happen at the same place, but not other locations (at the keyboard?)
does it happen around around certain electronics? radio, TV, microwave oven?
does it happen when you are standing up or sitting down or walk?
do you feel dizziness, heartburn or indigestion along?
how about your hydration level?
especially salty meals prior?
Do you wear a ring on your finger?
I used to get tingly fingers when I packed heavy and didn't understand how the backpack belt shifted weight off my shoulders. Now my pack's waist belt is tight, and my shoulder straps are gently touching, but without pressure on my shoulder's blood circulation.
I do believe you, but it is unlikely that a wristwatch's electronic functions are the cause. Something could physically be restricting the blood flow.