Vertex IN80 Pump problem

[Wretch]

I have been running my IN80 for about a month and a half. It was working great to start, nice fine bubbles(was a little loud). Now after doing a water change I am getting no bubbles and it just seems water is being pushed up the skimmer(different noise now, just as loud). Took the pump apart and cleaned the impeller. There were no issues there. I dont know if I should replace the pump or buy a new skimmer as they might be close in price. Advice please. Thanks.