Color fades in one washing

Hello! I have naturally dark brown hair that I have professionally colored a medium auburn/red shade (level 6) every 4 weeks for a root touch-up. For the last 10 minutes or so of processing, my colorist combs the dye through to the ends to refresh the color, but after one washing, my hair is markedly lighter! It is literally 2 shades lighter in one washing! The entire color is altered. Instead of a rich medium auburn, I now have a golden medium brown. The red is almost completely gone. I don't understand why this is happening. I know that reds fade very easily, but, after only one washing to be so faded?? That doesn't seem right to me. When I called my colorist to complain about this, she seemed rather nonchalant and simply said "come in and we'll see what we can do". I was just at the salon for color less than a week ago, why should I have to go back already? Can anyone offer any advice?

Thanks!

This is kind of strange. It's a well known fact that Red fades the fastest, but from what you're saying it sounds as if your hair is just not holding the color. I'm surprised that the color shampoo isn't working.

What else has been going on with your hair? Have you had any other chemical processes done to it - perming, relaxing, anything like that? The reason I ask is, perhaps your hair is damaged from something and is just not able to hold the color? It doesn't seem likely, but without knowing what else has been done to your hair, I can only surmise that damaged hair is the reason.

Thanks for your responses. To KB: My hair doesn't have any other chemical processes such as perming, chemical straightening, etc. The condition of my hair is not too bad either. Maybe I need to go to a different colorist.... To Sher: I'm not sure if my colorist used a red filler in her color formulation. She recommended using a color-depositing shampoo, and like I said, the color grabs in certain areas, producing an uneven color effect. It did more harm than good.