QOS Setup problelm

I have certainly has my share of problems with hi-tech gear with this thing being no different and this has caused me to once again look to this community for some answers.  I am having an issue with assigning or setting up the QOS Feature on this unit.  It seems to have a mind of it's own, since the last patch and It is sure getting aggravting to deal with.  Everytime I go into "routerlogin.net" and set up the system, the way I like, and exit back out, it erases my setting and reverts back to it's former basic setting, in this catagory only.  Simply put, it reverts to default settings each time and I have to go back in and re-set it all to what I want.

Is there any way to stop this and fix this problem, permanently?

I await your suggestions and/or answers.  Thanks

Johnny