I had the Boston Acoustics Soundbar hooked up to the AVR 1911 with no issues. AVR 1911 is now having HDMI issues so I hooked up the soundbar to the AVR 391. AVR receives audio via Optic Cable from Cox Cable Box. The AVR 391 (Left/Right Front and Center Channel) are hooked up to the sound bar with 12 gauge speaker wire running approx. 8 feet. The sound bar gives bizarre and random feedback (sounds digital) at times but then stops working after 5 minutes. If the AVR 391 is shut off for a period of time and turned back on, the soundbar will work, but again for only 5 minutes. This happens also when using HDMI input from Cox Cable box to AVR and then HDMI from AVR to TV.
Any assistance would be greatly appreciated.