In Response To 'Re: Re: NMinimize - explanation of warning mess...'
If your actual problem is not too big and complicated then you might have a lot more success in getting an answer if you just posted the smallest simplest example notebook, which if answered would almost certainly give you everything you need.
It does need to be clear exactly what it is that you really want, to avoid the "well that isn't actually what I actually wanted answered, how about this instead."
Sometimes searching for solutions can require so many iterations that there is little or no accuracy left. Sometimes searching for solutions finds the process of inching towards the solution goes slower and slower and slower. It is often difficult to tell exactly why it cannot get you the desired answer with sufficient accuracty.
Sometimes problems are "ill posed", they are in a form that results in very poor and inaccurate solutions, if a solution is even found. Sometimes in cases like this it is possible to learn how to change the problem to something that will give a much more accurate solution much faster.