How do you not loose money or a client when stuff doesn't perform? "What are you going to do about it?"
The answer should be: "I'm going to sell you another brand this time and charge you to install it"
The client's expected answer is: "I'm going to charge you nothing because it's under the manufacturer's warranty and I'm scared you'll go someplace else when I tell you it's not my fault and you should pay just like you pay with every other product you've ever bought, but somehow AV is different from IT and Auto and Appliances and Plumbing and Electrical and ......"