Here is the DEFINITIVE thread on the CPS (but there are several here): https://www.crossfireforum.org/forum...on-sensor.html

Do yourself a big favor, buy an extra one. Mine still has not failed, but I have one in the trunk.
Yea, they fail THAT often.

Of course, it MAY not be the CPS, but the way you describe it, odds are, your problem is a $55 part that is easy to change and goes out on many of us.
Any "Shadetree Mechanic" can change one in 10 minutes. INstructions in the thread above.