Help - Image Getting Whited Out?

I have a question about a problem I have with some analog cameras, so may not be the right place to post but thought I'll give it a try. I have several cameras that are about 4 years old. Over the course of a day or so they will go from a normal picture to getting lighter and lighter to a complete white out. It has nothing to do with the position of the sun, as some of them are protected and don't get hit by the sun at all. After a while, the picture will go back to normal. Someone told me the reason for this is that the iris is going 'bad'. What does that mean?

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*******,

** *** **** *** ****** ** ** ** ** *** see **** ** ***** ****?

** ***** ** ** **** *****. ** ***** ***** *** iris ** *** *** **** *** **** *** ****** ****** adjust *** ******* ***** ** **********. ** **** * ****** iris ** **** **** ******? ****'* *** *****?

*** ****** ** * ** **** ****** (***-******-*** * *****).

*******,

****** *** *** ****** *** *** ***** ******. ********** *****!

***** ***** ** **** *** ****-**** ******** ***** *** **** as ** **** ******* *** ****** ** *** ******* **** the ****. **'* ** ***** ****** ** * ** **** guessing **** ** **** *** **** ** ********** ******* ******* (depending **** ** ****).

***'* *** **** ****** **** ** ***.

***, ****** ******* *** ****** *********. ** *** **** ***** simply ** ** ****** ** ****** **** ************ ** ******.

* ***, ** ******* ******** ** *** *** **********, *****? If **, ****** **** * ***** ****. **** ********* *** lens ***** **.

* **** ***** '*****' ***** ****** ** *****. **'* *** as ** *** ***** ** ******** ****** *** ***. *** iris ** ******* ** *** **** *** ** ********** ** the ****-**** *********.

** ***** ** ** ** ********** ******, ** * ** not **** *** **** ** ******** ** **** ** ** just ****** *** ****.

** *** **** ******* ** * **** ******, **** *** are *****, ******** *** **** (*** ** ** ********) ***'* help.

**** *******, *** **** ******* ** **** *********? *** **** all ***** ********** ** ****** *** **** ****?

*** '***** ***' ** *** ****** ******** ***** ****** ***** as *** *** ***** **, ***** *** ***, *** **** the ******* ***** **** **** *** *** **** ****. * have ********* * ******* **** *** ********. ** ******* ***** 1 **** *** *** * ****** ******** ** *** * others ****** ***** *-* ******. **** ** ****** ***, ** does *** ****** ***** *** *** **** *** *** *** long. *** ** *** ******* *** ******* *** **** ** but *** *** *** **** * ***** ** *** *** no ******** ** ***.

***** ****** **** **** ****, ** ** *** **** ******* is *****. *****, ********?

*** ***** * ***** ****** *******? ** ***** ******* *** all ******* ** *** **** ******* ***** ******, ***** **'* time ** ****** *** ******* ****** *****, ******** ** ** 12 ***.

** ****** ******. * *** ****** ** **** * ****** for *** ****** *******, *** ***'* **** ***. * *** find * **** *****, **** ** *** ** ***** **** DIP ****** ** ******** ** *** *** **** *** ********, aperture, ******* *****, ******************. ****'* **** * *****, ** ********* **** ***** ** doing **, *** *'* ****** **** ** ******* ***** "******** correction", ******* ** ***** ***** ** **** ****, ** *** same ***** ******* *************.

** **** ***** **** ***** ******* *** * ***** ******, so *** *** ** ****** ******* **** *** ** **** ***** ******, *** **** ** ***** lenses *** ******* ********* *** **** ** *** *****...** ***'* likely ** ****** *** ****** *** *******, ********.

**** * ******* * ***** **** ** ******* *** *******. Just ***** ** ******* **** * *** ** ** ******* would **** *** **** ***** ****** * ********** ***** **** frame.

*******, *** *** *** *** ******** **** ***** **** *****, but ** **** ***'* *** *** *** *** ***'* ***** put'em *** ** ******* **** ***, *** *** **** **** them ***** ** *** *******:

*** ** **' ******* *****, ******* *** ** ****smoky **** covers on it. Some domes even come with both smoky and clear when you buy'em. If you're not so lucky, I seen'em on amazon for 15 smackers. Worth a shot, barely.

**** ****