My interior lights were flickering on and off, what could be the problem?

My interior lights were flickering on and off but I wasn t driving or anything. I had it in park and I did have the driver s door open it was night time too. I don t know what could be the problem btw it s a ford 500 2005.
It was raining all day so maybe the water gpt inside something but it wasn t raining when I had the door open. Oh btw it was also making a service ding ding npise too with every flickering.

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