Como esta Alberto!
When your Cat loses power and you attempt to restart it, does it crank, but never turn over?
Reason why I ask is it's typical on these Cats for the crankshaft position sensor to go out. I have a '99 Cat and I experienced the same thing. See my the threads I put up on the Omega forum.
http://www.omegaowners.com/forum/YaBB.pl?num=1173979625
I also put up a thread on this forum titled "Bought new CPS, Still Won't Start".
Hopefully, it will give you some insight on your issue.
Do you have a AutoZone there in PR? They can scan your Cat and retrieve any error codes. After installing the crankshaft position sensor, and while still experiencing the car not cranking, I took it to AutoZone and the scanner read an error P0603 which referred to a "Keep Alive Memory" error. When I went to the dealership, they told me that an "Idle Relearn" had to be performed.
I'm new at this myself, so I hope this may shed a little more light on your issue.