2013 XK Base Convertible

When I first noticed it happening, I suspected it was a low battery. I replaced the battery with a new AGM battery and charged it overnight with a 15 amp charger. Another thing that happens is the light turns off if the fog lights are turned on.
My mechanic suggested I ask you guys. Any suggestions? Thanks, in advance.

 

After searching for answers, as an act of desperation, I cycled all the lights off and on several times. It went out. I love this car. Why else would we put up with it.