Never start a solo on the root of thechord.
So don't start a solo on a 12bar in G on G? Why?
Because it's not hip. If the song is in G try starting your solo on a Bb or F. You could even start it on D or E. Stay away from G unless you're ending a solo and even then you want to avoid it. Some players never use the root. That's the bass player's job!
The same thing applies when you move to the IV and V chords.