My 2010 Town & Country abs light comes on and bell rings and the center dash lights flash and the speedometer spins back and forth.

I began having problems beginning of May when driving to work when the ABS light
came on and the bell began to ring.  Then all the center dash lights came on and the
speedometer fluctuated back and forth.  Took to mechanic thinking it was alternator, no
codes. replaced battery since it was original.  Same problems a few days later.  Took to
dealer, has been in and out (mostly in shop) and no clue what is causing problems.  It
also died when making a turn and coasted downhill and pulled to side of road.
Restarted. Previously radio and a/c went off when stopped at red light, also thought
engine died and then re-started up on own within a few seconds.  The temperature,
speedometer and dash lights flicker before the abs lights and bells go off.  Have had the
abs module replaced and a wire replaced in the abs hub.  Still in shop and no answer.  
Afraid to drive car for fear it could die in traffic and not start up.  Live in San Antonio and
been to 2 different dealers.