My plugins seem to only work once or twice? Meaning they're fragrance aren't as powerful or no longer fills a room. Is this common? Is there anything to fix?

Mine does that too. It is not the flower its self, but the fragrance inside. After a while, it will fade. There is really no fix to it. They work for about a week and then they lose the scent

Ours seem to work ok, I would try a different plug, or maybe try a different warmer? It is possible it is not warming it enough, is the liquid going down?

Mine work great. Maybe try a different pluggin??