Originally Posted by zuley
Try using a hair dryer and heating up the vinyl prior to pressing the air bubble back down.
X2 sounds like a poor installation job. A small bubble trapped during shoddy application at factory will bubble and expand when in sun or hot temps.
If the bubble is isolated to one single location (not widespread) :
I would pierce it with a razor blade, work out bubble with thumb and then gingerly dab the opening with clear nail polish. If you encounter ffurther bubbling from there I would get them replaced under warranty.