Does anyone know a good Infiniti G37 Specialist/Mechanic they recommend in the East Bay or Marin (Bay Area)?

I'm having wheel alignment issues with my car that my dealer is unable to resolve. My wheel alignment keeps getting messed up after three weeks or so after a fresh wheel alignment (at the dealer). Steering feels loose and dealer says nothing is damaged with the suspension system. Got three wheel alignments done and same problem keeps occuring.

Wanted a specialist to have a second look at it as I feel like the dealer is giving me the runaround. Car is 2010 G37S Sedan with 40K miles.

Thanks!