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Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Frank.
This sounds like you've got a low/bad battery in the handset that is beeping.
As an initial check, swap the battery between this "bad" handset and one of the good ones, and see if the problem follows to the previously working phone , which would confirm a bad battery. If that is the case, you can order a new one here: http://amzn.to/1ovuVVZ