2005 Pacifica EVIC Random Resets

I have a 2005 Pacifica and have recently noted that the EVIC will shut down for 2/3 seconds then return to working order.  The event normally occurs after hitting a bump in the road.  The strange thing is that it does not occur for every bump and only happens about twice a week.  The car does not power down but all lights on the EVIC, and all guages turn off and go to zero for 2/3 seconds and then when the accelerator is hit the EVIC comes back on again.  I am not sure if the EVIC is connected to the shocks and I have had it at a dealer twice to get the electrical system checked.  On both locations the dealer had no problems appear on his electrical diagnostic tests and could not replicate the problem.  I am open to any ideas.  I have checked the TSBs for the 2005 pacifica and there is nothing in that arena.  I am not sure if it is loose connection on the circuit board or if it is related to an inappropriate ground.  I don''t even know where the circuit board for the EVIC is located.  I can''t believe that it is a loose fuse because it happens so intermittantly.