Skimmer problem

[Troy F]

I have a PM Bullet 3 skimmer with the original beckett injector. Yesterday it decided to stop producing foam, I soaked it in vinegar all night last night and it had just been cleaned on Thursday and I took it apart and cleaned it again this afternoon. Nothing, I can't find anything. I've thought of the water chemistry being off, too much oil or something but can't think of how or why that could happen. Have any of you had problems with a beckett cracking or breaking? I did bang it against the sink during the cleaning on Thursday. Now keep in mind that this is the sealed housing that came out on the first models so cleaning it can be a pain but it's always done and I've never had a problem. Anyone have an idea.