My rear defroster switch flashes sometimes for about 5 seconds, then the light will stay on as normal.

I know it does this because it uses a lot of power, and then it returns when power is available again.

But everything is fine! I even have a new (roughly 3 month old) Mercedes-Benz battery. I can leave the lights and radio on for hours, and the car will still start. The battery and charging system are fine.

I know this is nothing to worry about, and probably a pointless post.

But.............. any thoughts?

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)