Open Youtube and play a stereo video . Don't stop or pause it
Right click on a mouse to exit Youtube while the video is still playing.
Open SPMC with passthrough correctly set up
Play a DTS MKV video. Make sure that your receiver detects the 5.1 DTS audio
Let this play for an hour
Pause it
Wait an hour (If an hour doesn't work let it sit overnight)
Right click on the mouse to exit or swipe up with the mouse and hit home
Go back to Youtube and the audio will be muted since Youtube doesn't use passthrough.
Unfortunately all of your roms have had the muting issue on stereo audio feeds. The muting doesn't affect the 5.1 DTS passthrough audio HDMI bitstream in SPMC or MX Player. The muting only affects stereo audio like Youtube, Pandora, Vevo, iHeartRadio, PBS kids, Youtube Kids...
I was also able to reproduce this with SPIDF passthrough too. FYI when I use SPIDF or HDMI bitstream audio output none of the normal Android OS beeps and sounds ever heard. I doesn't bother me but just an observation.
I haven't tried yet to replicate the muting issue with my R28 hooked directly to my TV via HDMI or SPIDF. I've always used a Yamaha or Pioneer AV receiver.
I don't know if this helps but when the RK3188 roms had a similar muting issue some fix was made to allow the default output to handle HDMI bitstream.. You had to know to pick the default output and not choose HDMI bitstream.
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