Power surge?

If that looks OK ... think about where you are on the power lines. The closer you are to anything with switchable taps ... the higher the chance the following may apply. The electric companies use switchable taps to raise/lower voltage to get power to flow on distribution lines. Sometimes it doesn"t work out right. We use to have bulbs blow in batches (not on the same switch). Had a recording meter put on our lines and found out they would jump to 135 volts when the power company changed taps. Roger

My first thought would be to check the voltage balance on both 120 volt sides of the incoming power. A bad neutral can cause voltage unbalances that would pop the lightbulbs. Just check the voltage from each side to ground. They should be the same or at least very close. If you find something wrong, you can get it fixed If nothing is wrong, you will have peace of mind.

There was a large basement with lots of lights. (Lots of 200 Watt incandescents, so there was high inrush current.) Occasionally, when someone would flip on the basement lights, weird electical stuff would occur in other parts of the house. Finally, one day I flipped on the cellar lights, and a surge suppressor in the living room, to which my son's medical equipment was connected blew, and actually started smoking.

I traced the problem to a loose neutral connection at the buss bar in the (almost new) entrance panel.

The odd thing was, nothing else in the house seemed to ever screw up the voltage balance, just when the basement lights were turned on!