Today I was using my power washer and the pressure was low and the hose vibrated excessively. I released the trigger and when i pulled it again the pressure was back and it stopped vibrating. After another minute or two i released and pullled the trigger again and it was back to being low and vibrating. I kept using it and kept stopping once in a while and starting again and now the pressure is back and the vibration is gone. I used it for quite a while and it never gave me any more problems. Any ideas on whats going on ? Are the seals going out or did i have some dirt in it or what?? (it shouldnt be going out the pump has only been used ocassionally for about a year) It is an AR sxmv4g40 direct drive with bolt on unloader and a 13hp honda. Im starting a biz very soon and gotta have this thing working right