You like to move around but you feel trapped – raising your arms over your head causes the shirt to move up considerably. This causes it to come un-tucked too frequently, make you feel as though you are in a straight-jacket, or just mildly annoys you.
If you have selected Tailored Shoulder/Armpit fit, then you’ll want to switch that back to Full Shoulder/Armpit Fit. If you already have selected the Full Shoulder/Armpit fit, then there is no easy fix other than to make the shirts chest and sleeve width larger. You may also want to consider adding 1″ to your shirt length so it doesn’t become untucked as easily.