Dark history of all time for Astro. The Measat 3 satellite outage since 21 June 2021, which lasts at least 3 consecutive days.

Luckily on around 23th June evening, Measat/Astro managed to recover some HD channels and brought back 11642MHz and 11682MHz transponders first.
And fortunately since 25th June, all Measat 3 transponders have been brought back alive. Nice
As usual, I've performed blind scan on my sat receiver earlier..
After studying and comparing the differences of the channel list for an hour or so, I realise that Astro have been keep migrating/duplicating channels across transponders from one to another, and looks pretty messy, like a jumping frog.
No wonder la some people, when they press ch103, it comes out totally different channel (i.e. ABC Australia) instead of TV3.
And some experiences situations like "earlier can watch, now suddenly cannot watch".
All because they carried out "sudden changes" of channels/bouquet ID every now and then, as it is part of its channel recovery efforts, especially migrating all SD/HD channels from 11.7-12.75GHz back to 10.7-11.7GHz frequency range.
You said ch300-335, almost 70% of all channels appear as SCNA, is it?
Try Restore Factory Settings again, and see if you can get those channels now.
Btw what Astro box are you using? HD/PVR box or Ulti/Utra Box?