Ion Explorer Outback Shuts Down While Using and with Battery Indicator Showing Full Bars

I bought Ion Explorer Outback at Sam's Club back in May 2017. Because of summer plans, we haven't opened it until now. We charged it overnight for the first use but the unit won't stay on. Whether it is using Bluetooth or radio, it powers off after a while. Battery indicator shows full charge. It's too late to return back to Sam's and I would like to avoid having to pay shipping to return to Ion since it is still under one year warranty. I read "community support" and everyone seems to have battery problems. I don't think I need a new one although I guess I could have gotten a defective one. Anyone else having this issue? Any suggestions would be much appreciated.
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