I recently purchased a refurbished Samsung HW-E450 and I'm having issues with the subwoofer. I have the soundbar connected via an HDMI ARC to my Vizio TV. The soundbar is working great, but the subwoofer keeps losing sync. After about 5 minutes the subwoofer stops working and the red and blue light start flashing on the subwoofer. If I unplug the unit and then plug it back in it will work again, but after another few minutes the same thing happens.