Bests & Worsts Reviews from Amazon

I bought this power washer a year ago to replace one from another brand that I had for 25 years. It worked wonderfully last year. I stored the Karcher according to the directions at the end of summer. Today I pulled it out to power wash the patio and the dirt blaster initially pulsated in a start-stop fashion, like it would make part of a circuit-pause-part Circuit-pause making it very hard to control the wand. I looked up troubleshooting and discovered most everything out there is for different models. I finally was able to take the tip of the wand apart. It was not clogged. My other wands and attachments work fine, so I don't have a cavitation issue or a water pressure issue. It wasn't dirty and had zero mineral deposits or dirt inside the tip or any of its components. I put the tip back together and it worked normally for about 30 seconds then froze in one place. Tapping it on the ground made no difference. Every time I unscrewed the tip, shook it and put it back together it would pulsate for 30 seconds then freeze in place with a single, reduced stream. I used it maybe 12-15 hours last year. For $279 I would think it would last longer than that. I notice the same power washer is now $100 cheaper on Amazon. Not only did I not finish power washing my concrete on what is probably going to be the only day in a two week period with nice weather, Now I also have to pay $25-30 to replace the wand with an "official replacement" that all the reviews say doesn't work as well as the original. Very disappointed, especially after having such a great experience with it last summer. I doubt I will ever purchase a Karcher product again.