The light bulb in my Whirlpool WFG231LVS0 oven keeps burning out. I've replaced it several times, with new bulbs of several different brands (all marked as being appropriate for ovens).
The new bulbs seem to work for a week or two and then stop turning on.
It seems like the filament is broken. As I rotate it around (see the gif below), I can hear something inside.
I've read elsewhere that oven lights often stop working either because of slamming doors damaging the filaments or because of liquid splattering onto them. I don't think that's the case with mine.
How can I diagnose and fix this problem?
P.S. This is not a new oven, and there had been more than a year of normal usage before this problem started happening.