If you are actually using up all 8GB of RAM, then your system's behavior is both entirely expected and quite correct. That's the whole point of swap.
A better question might be: what exactly are you doing that routinely eats 8GB of RAM?
If in fact you really are legitimately needing >8GB (which seems unlikely), then the solution is to install more RAM. If not, then you can experiment with "swapiness" to reduce swap activity. (Google has details.)
Oh, and stop resetting your system merely because you're feeling impatient. You run a risk of data and/or file system corruption.