The key turns but its don't seem to be reading or something

What is your question?

every once in awhile i put my key and turn it and it saids nothing like its not there maybe sitting for about 15mins or less it will start up! it did like 4 or 5 times then for 3 months i didn't have the problem anymore at all and then all of sudden it did it again 730pm til 215am it wouldn't start then it started like 6 hours later now its been sitting for 2 days and want start all the lights work the radio comes on any suggesting please