Vyvanse - Tolerance Built?

I have been taking Vyvanse for years now. It has worked great up until the past couple of months. I’m not sure what’s going on as nothing in my life or lifestyle has changed. I take it on weekdays. On the days I take it, I feel the exact same as I do on the days I do not take it.

It has gotten to the point where it’s now affecting my work and others have noticed.

Is it possible that my body has built a tolerance for it over the years?

I have a message out to my doc, but still wondering if anyone else has experienced this? If so, what medication did you switch to that worked for you?

Thanks!