Hi! This happened to me today. I immediately set up an appointment at the Apple store. I went on a mini deployment and left my watch at home - series 1 - just out of warranty. Well I got the flashing Apple logo and it won’t reboot or anything. The Apple store told me they’ve seen this before and I have to send it in. If it’s a hardware issue, they’ll replace it free of charge but since II am out of warranty if it’s a battery issue, I have to pay $199.00 to replace it.
Needless to say, I wasn’t happy with that customer service. Seems to be happening too often. I left the store as I did not agree to paying the $199 if they found it to be the faulty battery. And I called customer service. They handled the situation and apologized for the store telling me I was neglecting my watch. Neglecting!
They’re mailing me a box to send it back in for diagnosing and will either fix or replace for free.
Give them a call - it’s a known issue. I’m glad I didn’t let my experience at the store deter me from contacting superior service via telephone.