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I know you mention newer DME relay but that doesn't really mean that much from what I've read. You might want to switch with a known good one to rule it out. If it loses contact even briefly it will kill the fuel pump. You also mention that the ground have been cleaned recently but I think on an intermittent problem such as yours I'd go back and check that the nut is tight for the battery ground, Transmission to chassis ground and the intake runner ground. I'd also do a visual of all the plugs in the engine compartment to make sure they are making solid contact and that one isn't missing one of the clips that hold them on.
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