Intermittent crank no start issue?

About 7 months ago, I bought the vehicle listed above CVT. The owner before me told me about a crank/ no start problem. After owning the car for 7 months, I have experienced the problem a total of 12-15 times (I guess). I have done a lot of maintenance to my vehicle so I will make a list because it is quite a bit.
1. Resealed transmission pan.
2. Fuel pump.
3. Front/Rear differential flush and change.
4. Oil changes.
5. PCV valve.
6. MAP sensor.
7. New battery.

I just ordered a crankshaft position sensor, but I'm truly at a loss for words and don't know where else to look so I came here. My family is a bunch of mechanics but even this has them scratching their heads.
I have a fuel pump relay I am replacing this weekend, and after I replace it the only other option I have (i think) is to remove all camshaft position sensors, and to hook a multimeter up to check them. Can anyone make suggestions on what else could possibly be the issue?
This problem isn't worrisome. When the problem occurs I turn the key off and try to start 3 seconds after the key is in the off position it will start every time. I'm not waiting minutes for my re-crank and start. Also, I have been researching about this problem and some people say it could be a part of the Anti-theft system. Any suggestions or comments would help, and I truly appreciate anyone who reads this whole post. Thank you.