[The shop tech said ] 90% of the time it's the cam sensor. He also said 1/3 of the time (math issues) it's the computer
I suppose towards explaining the surprising math it could be both the cam sensor and the computer sometimes. 
My guess, something heat related in the ignition system. Nevada’s suggestion to take a flyer and replace both the cam and crank sensor seems like a reasonable bet.
If I had this problem when it stalled I’d do a test of the ignition system for spark right then while it wouldn’t start, on the side of the road. Once narrowed down to the cause being definitely lack of spark, that makes finding a solution a lot easier. If replacing both sensors doesn’t fix it, consider to ask your shop tech if there’s a simple way you could enlist yourself as a deputy-shop-tech-on-site and check for spark yourself next time it happens.