Basking light

My basking light turns off randomly what can cause this i already replaced the fixture and I have it plugged into an extension cord because there are no outlets nearby

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Maybe you have a loose plug? Or one of the cords has been stepped on & now has (internally) a bad connection? Or the bulb has a defect?

Is the light regulated by a rheostat (lamp dimmer)? If so, & IF the bulb IS being dimmed, you might have power dips that result in not quite enough power
to keep it on. (power dips are out of your control...that's the power company's department)

I forgot to update this post it is the bulb that is messed up i am going to replace it thanks for the information

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