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Well, you obviously know it is a temperature related problem. And being a no-start, it is probably either ignition or fuel. What I would do if I didn't feel like getting my hands dirty, is take the car to a Volvo licensed dealership. If you have some experience working on fuel and ignition systems, I would suggest doing some probing with some dry ice or ice cubes. Basically, warm up the car, and get the car to the point that it will not restart. Then systematically, use dry ice preferably, cool select systems one at a time, until you find the culprit. As you descriebd, it takes about an hour or more before you can start the car. Thus, if you cannot start the car after you have cooled a particular system, that system is not the cause.
But before you do the probing, I would suggest doing a disassembled visual inspection of your ignition system. Look at things like the distributor, cap, the wires, the plugs, etc. Also, use a multitester to check for continuity or lack thereof, of various components. Temperature changes cause expansion, and contraction, and these changes can cause circuits to open and close when they are not supposed to.
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