Can someone answer this question?

My car every 2-3 days won't start.  I have had a new crank sensor, spark
plugs,and battery put in. They have tested the fuel and there is not an issue
with the gas.   It eventually starts again that night.  It alot seems like its on a
timer or its a computer issue?  I have been to every car dealer around even
ones who specialize in foreign cars and no one can seem to help me.  Can
someone help me here?  Thank you!