Could be a fuel pump or a crank sensor issue from your description of it. The crank sensor can get moody when hot, and without it working correctly the car will crank but won't start. But then a few minutes later it will run just fine. It's typically an inexpensive part and easy to replace.
It could also be a failing fuel pump, bad fuel pump relay or fuel delivery issue. I had an issue with the wiring from the fuel pump to the pump connector and had to resolder those connections due to a bad solder joint. Pierburg pumps, which I assume your is, usually don't have intermittent problems though, they either work or they don't from my experience.
Some diagnostics you can do is listen to the pump and make sure its always running at the same speed, not cutting out at times or slowing down, check the fuel screen at the bottom of the pump and the fuel filter to see if you have some kind of gunk in there blocking things up. If you have a Power Probe, you can send 12v directly to the pump connector and listen to the pump run to see how it sounds. Some say you can check the resistance across the +/- and see what you get, although I'm not totally confident that is always that useful. Normally resistance is low, under 10 ohms iirc, but I've seen different values on pumps that work fine.
I'm currently pulling my pumps to swap the old rubber hoses to new nylon hoses from the pump to the top hat. Many Corrados have the factory hoses replaced with standard fuel hose, which is not rated for submersion in fuel, and so deteriorate and leak over time. Here's what mine looked like.
End of hose delaminating...
Rubber hose turning into black goop...
Imprint of clamp on hose...
Completed with nylon hoses...
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