Why would the audio on my TV just stop working for Optik TV only (and not my other devices?)

[edmiidz]

Basically yesterday I was watching YouTube from my Optik TV, and then it crashed (20 minutes spinning). When I unplugged the Optik TV unit power, and plugged it back in, everything seemed to work normally, except for the audio. I can watch live TV, recording TV, and apps like YouTube and Netflix, but none of them produce audio after the crash.

If I plug-in my Amazon Fire Stick, audio comes out fine, but If I try plugging theOptik TV unit into the same HDMI port, I hear nothing.

I've been on hold for 10+ minutes, and not getting any help from TELUS Home Services in AB & BC Support.

[FuzzyLogic]

Possibly the PVR volume got set to 0?

Make sure the digital box volume is set to 25 by using the remote volume button while in OPTIK mode.

[edmiidz]

That wasn't it.

After about an hour on hold, I got through to an agent who performed some remote diagnostics on both my modem and PVR.  He fix the issue this time.

When I asked about steps we could do to prevent this from happening again, he said that I could try a factory reset or calling them back. I was not provided with any root cause or preventative action from this recurring. 

I guess spending an hour on the phone with Telus every now and then it's just the cost of doing business with Telus.