Trans. code P0758 shift solenoid B
 

'07 Mazda 3 GT 5speed auto setting Code P0758 Shift Solenoid B (Electrical)

Once a week or so the Trans will down shift violently, MIL and AT lights come on then goes into limp in mode. I shut the car off, restart and shifting is normal again.
I dropped the pan and replaced Shift Solenoid B as per code.
Still the same problem.
I've done resistance test on all Trans wiring and solenoids everything checks out.
I've run out of diagnostics procedures, so I’m thinking of throwing in a TCM
Any other ideas?