I have 150 dives on my Oceanic computers, plus pool sessions, and I've had one failure.
I have a ProPlus2 (70 dives), an Atom2 (100 dives), and a Datamask. The datamask failed on the second dive, but we figured out it was defective from the factory. My LDS immediately exchanged it for a new one, and it has worked perfectly.
All computers are going to die. It's a fact of life. Take care of them, get them serviced, change the batteries.....they'll be great.
My instructor had to get his PP2 serviced this Fall. He has over 2000 dives on it and it has never had a problem. He never rinses his gear, he just throws it in the back of his truck, he doesn't bother putting the comp in a case or anything....... he's like the Samsonite gorilla of dive gear. He had his PP2 serviced because the tank pressure remaining was out of spec.