I don't know why this works for us, but anytime we have turned off the propane for any reason - when we turn it back on we always light the stove first and let it burn for about 20 seconds. Even then it takes the newly turned on propane a few seconds to reach the stove. We don't turn the burner on high to light either. Usually.. we turn it to med or low. You're sure you have the right tank switched on.. yes?
If we don't do that we've noticed the furnace takes multiple tries to ignite, and yes..sometimes....the fridge auto light has bounced back and forth between gas and electric.
Not sure that's your problem, but it sounds a bit like what we go through.
Good luck!
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~ It's a fine line between hobby and mental illness ~ Dave Barry
Carl, Felicia, Eva & Pip (the fur kids)