Twice.
First time, my then band was playing a showcase, and Sony records was in the audience.
Our then guitar player was an amazing soloist. However, he went behind our backs and got stoned in the bathroom right before we went on. Then on stage, he had trouble working his amp because he was too stoned to remember how his amp worked. Once he got that going, he then decided to veer off the well rehearsed songs and solo over just about everything. Ad given it was the 90s and not the 80's anymore, that didn't go over so well.
We got a letter form Sony "we like the band but hate the Eddie Van Halen wanna-be"
And that was it. He was gone. But our then "manager" did the dirty business. And of course, Sony never came back to see our new "now with less shredding" line up.
In another band, I had asked a buddy who I knew was into similar stuff as ours to come on over and add his touch of guitar skill to our songs. He showed up, he was cool, but it just didn't gel. And then he made the comment that maybe we needed to write better songs. Doh! So after two such rehearsals, I said thanks, but no thanks, this isn't working.