I have a problem with a Sharp 43" Roku TV running update version 14.1 which keeps causing my amplifier to go silent 12 minutes after the TV is switched off. I have tried disabling the HDMI ARC feature on the amp and switching to using the TV's optical output instead to get audio back to the amp, but the problem continues regardless. I suspect that the only way to stop it happening is to disconnect the HDMI connection between the TV and amp each time the TV is switched off - not an acceptable solution. No other device has caused this problem with this amplifier previously, including the previous TVs used with it.
The only way to get sound back on the amp is to switch it to a different input, then switch it back again.
The 12 minute period seems to be connected with the time when the TV transitions from what appears to be a "warm standby" state, using about 20W of energy, to a "cold standby" one when the TV uses around 0.4W instead. The lights on the USB media also all go off at this time.
The same problem happened with update version 14.0.
Can anything be done to stop this behaviour?
The amp is a Teac AG-D200, essentially a rebadged Onkyo, similar to the TX-NR414 apparently.
