My soundbar has been fine for 2 years, exact same configuration i.e. EArc cable from soundbar to QN95A Neo TV. Last week had this issue of the soundbar 'searching' for input to deliver output .i.e. switches every 2 seconds DiN eArc > Blue Tooth > wifi > hdmi > TV speakers - around again and again in a loop. 

Even in the smart things app you can see the soundbar cycling through.

Tried:

-Resetting soundbar (very difficult when the sound keeps cycling) 

-Software on both TV & Soundbar (both up to date)

Was there a recent update that has caused this bug?