When you screwed it in, did you touch it with your bare hands?  I ask because you said it was only two days in. The oils from our skin can cause a hotspot to form on the surface of the bulb. I always use gloves or a clean cloth to handle and screw the bulbs in.
To clean them, use a dry soft paper towel (like Viva), or a shop towel, or microfiber cloth. A gentle buffing motion. You don't want to scratch the surface of the bulb because that can cause temperature differentials too.
Many kinds of bulbs share this type of sensitivity, including automotive bulbs, grow bulbs, etc. Pretty much only household lightbulbs are ok to touch.