For changing mobile number, did you try this method?
DTH Updates - Change Your RTN Online
I don't have any hanging and restarting issues after updating the software to 1.0.2633. I was facing this issue before this update.
Unable to watch Xstream content is common issue on this box. Every time we reset the box, mobile number is getting disconnected from the account and the back end team needs to do something to fix it. I faced it yesterday when the engineer who came to check the audio issue reset the box. I had to contact the Twitter team again and they fixed it instantly. But it's an annoying issue though.
In your case all the issues are because of your number being wrong. Please try that link and see if you are able to change it yourself, then everything else should be easily fixed.
Also I understood that it's not wise to have too many issues open with these guys, as it'll be difficult to track.
Once your mobile number is fixed, we can raise the audio issue and track it.