Default [Q] XT912 And unable to connect to tethered phone

So I have 3 razr maxx, one of which have data plan on it which I use to tether the other two phones. I'll call that one A and the other B and C.

Phone B: No matter what slot or ROM I'm on, I can see and connect to the AP provided by phone A
Phone C: No matter what slot or ROm I'm on, I can see but can't connect to the AP provided by phone A


Keep in mind here that all are razr maxx. Phone C even flashed back to stock using droid razr utility still can't connect to phone A but it have no trouble connecting to AP from router anywhere.

Any thoughts on what to try next to get Phone C to connect to Phone A?