Car sometimes starts and sometimes not alt. is good new starter and battery

What is your question?

if I take car out and return home it's ok when I'm ready to go out again the car is completely dead I stopped for gas and turned car off when going to restart car completely dead jumped started car with no problem got home turned car off went to restart car completely dead this occurs on and off been to dealer they replaced starter still same problem it has been to dealer for several electrical problems they have replaced computer fixed wiring for alarm and lights going on when car is off can it possibly be a ignition problem