This was a fairly common problem for older cars. It was usually caused by a bad voltage regulator, that allowed the voltage to get too high. I recently fixed the same problem on a 1986 Dodge.
I haven't heard of this on newer cars. The newer cars have electronics can be very sensitive to voltage spikes.
Anyway, I still suspect that the high voltage is the problem. You can have the voltage checked, but it may be intermitent. Most modern charging systems have the voltage regulator integrated in the alternator. An alternator can be pretty expensive to replace, just to try it out. You could have the alternator checked at an auto parts store. Or you may have to have it checked by a auto tech/dealer.
Another possibility is the type of bulb you are using. I replaced the bulbs on my Escape with Sylvania Silverstars. I blow them pretty regular; every 6mos or so. This is fairly common with high output headlamps.
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