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Did either of you have any luck finding root cause? I'm having the same intermittent issue. Typically if I leave it alone overnight it just works. I fidgeted with the MAF and camshaft sensor connectors one time thinking that actually did something (the next morning) but I think it's just time (or ambient temperature) that solves it.
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Vorex, yeah that was my experience as well. Typically the symptoms would go away overnight or after a day or so.
My understanding is that the capacitors and inductors inside the relays discharge and reset over time. Relays are basically made of light metals, plastic and ceramic so it makes sense that extreme temperatures would negatively affect them (mainly heat), but that's probably not the root cause.
My 370z is a 2009 and since it's a first generation model some parts are more likely to fail since the engineers don't have all the bugs worked out yet. If your car is newer, I would buy a brand new relay and replace the VVEL relay with that one, disconnect your car battery for a few minutes, plug it back in and drive modestly for a bit before pushing it harder.
Here's a video that you may find useful:
https://www.youtube.com/watch?v=DWmt6gorzUg