I resorted to installing an inline switch onto the power cable for instant reset of the soundbar. If I turn on the TV and the Q90R fails to communicate an ARC signal to the TV, a simple flick of the switch and away you go. (on the odd occasion, you may also need to turn on from the soundbar and also in the TV Sound menu from TV Speaker to Home Cinema).
Too frustrated to wait for Samsung to fix or let alone acknowledge that a problem exists. I have more important things to get on with in life.
The problem lays firmly within the coding and communication at the soundbars' HDMI Input. The TV is sending an initial signal to turn on the Q90R via the TVs' HDMI ARC Output port but the Samsung Q90R is randomly not accepting a comms. signal request. The ARC port needs to be in constant 2 way communication to work at all. In summary, the HDMI ARC Input port has either a hardware related faulty HDMI chip or they need to update the chips firmware for more reliable comms. with an input signal from the TV.
... View more