Fuel Relay stops working breifly

Have an 04 Sedona cut out driving down the highway but kept going after a sec. A
couple days later would not fire up. It would turn over but not fire, let it sit a minute
then it fired up like nothing happened, its done that a handful of times. The other day
went to start and sat for an hour would not fire up. Swapped the horn relay and fuel
relay and it fired right up, next day it died driving down the road same situation wouldnt
fire up... swapped another relay in and fired up. Now i can put both the relays in that i
thought were bad and car fires up no prob....what would cause this? bad fuel pump?