2010 Mercury Milan right side brake bulb

I have a 2010 mercury milan that the right side brake bulb light bulb keeps going out. Replaced 3 bulbs in last couple weeks with new ones and keeps going out. Thanks.

Can you see the filament? If so, is it actually burned out? I suspect you have some other issue, possibly with the socket.

Thanks. I will check the filament.

I concur with @lion9car’s advice. You are most likely changing out good bulbs due to a intermittent bad connection somewhere to the light.