crt tv color

[exhibit9]

hello, i have a problem with my crt tv. when i switched on the tv, the picture is black and white. for a couple of minutes,the picture turned to color but after 15 minutes, it turned to black and white again. any solution? thanks in advance.

 

[hang-the-9]

Replace the TV, seems your tube is going. Did you test things already to make sure it's the TV and not the cables or your source?