Try the free stuff first....

Disassemble the the coil/power stage assembly (couple of torx screws holding it together) and clean all mating surfaces and especially clean the internal contacts where the little pins slide into the springy contacts. I've even tweaked the springy contacts with a small screwdriver a tiny bit to make them contact a bit tighter. Also clean any mating surfaces that might carry a ground path to the chassis, as there seems to be coflicting opinions as to how the assembly is actually grounded. A very light film of dielectric grease on all mating surfaces may inhibit future oxydation. This is a known issue with aging Regina coils.

If that doesn't help, turn your attention to the crank position sensor. Hot restart problem are indicative of a failing sensor. But if that's the case you "should" get some sort of crank position sensor (or sometimes called RPM sensor) fault code recorded in the OBD.