Mmmmm....

For your case, I suggest you to reset your Astro remote control so that you can adjust the volume on your Astro box rather than to your TV.

May I know whether the:
- TV has digital optical output or not? If not sure, what's the TV brand and model?
- Does the soundbar have HDMI input and output ports (for HDMI ARC), or digital optical or digital coaxial ports?

Which Astro box model is she using? Is it Ultra Box?

She is using the first gen byond pvr box. With the grey/silver control panel on the right.
That PVR box has built in WiFi, right? Then that's not first gen PVR box... It's considered second or third gen of Astro PVR box, also known as DMT5 or DMT5v2.

There are multiple solutions to this.
But the easiest one would be just connect HDMI cable from Astro PVR box to your soundbar's HDMI input, and then another HDMI cable connects from soundbar's HDMI output to your TV.

LOL...
The soundbar has either digital optical output, right?
**also commonly known as S/PDIF

Then connect a digital optical cable from TV to the soundbar.

Are you sure you have solar interruption?

https://www.electronics-notes.com/articles/...olar-outage.php

Never seen before since at that time it happened I'm not watching 

My Diva HD channel recorded programme still watchable. Only Astro First/Astro Best will gone missing after expired.

That's one of the benefit for PVR box.
If it's cloud recording via Ultra Box, then it might be different story.

knowing astro..

+RM39.99 for Disney+

If you want to prevent unwanted experience as such (e.g. my parents are not very good in technology stuff, easily convinced by telemarketers on upselling offers...), the best way is change the Astro account ownership from your parent's name to your own name. If the account has any ongoing contracts on Astro, it will still remain as it is, even after you transfer ownership.
More info here: https://support.astro.com.my/sub-category/change-ownership
------------------
If you see HDCP error when viewing UHD channel/content on Astro, the official solution is you will have to buy new UHD TV, where almost all 4K UHD TVs nowadays are already HDCP 2.2 compliant. 
But convincing people to buy new TV because of HDCP issue is not gonna work anyway, so the workaround for this issue is, you'll need to use HDMI splitter or HDMI switcher that is HDCP 2.2 compliant. Here are some examples:

HDMI switcher:
https://shopee.com.my/Ultra-HD-HDMI-Switche...6693.7032984357

HDMI splitter:
https://shopee.com.my/4K-HDMI-Splitter-1-In...5931.6228108720
https://shopee.com.my/Apill-HDMI-Audio-Extr...5795.7078961393
https://shopee.com.my/Bohemia-HDMI-Audio-Ex...0424.5170611675

Yes

Ah, Astro uploaded a new video about its amazing and fantastic "Live Pause" feature:
PVR box users since 2010 be like: Hah. So funny. 

- Astro PVR box were introduced since 2010, and we've been enjoying your so called 'Live Pause' feature ever since 
- The 'Live Pause' that we've been using on PVR box, doesn't skip backwards 60 seconds like the Ulti/Ultra Box does
- Overall playback performance is so much responsive and reliable on the PVR box.
- Harsh to say, but that's the truth.

If you wanna know more, read this:
Are you an existing PVR box user? Thinking about upgrading to Ulti or Ultra Box? Before you decide, know the pros and cons first:
https://forum.lowyat.net/index.php?showtopi...#entry100498320

Wonder why my channel 326 suddenly can't play & show msg " I didn't subscribe & need go to channel 200 to subscribe"

Complimentary free preview went earlier than advertised.

End of coverage video package by Fox Sports Asia