@Grandadfatboy don't be too harsh on Samsung. When you buy a mobile phone you pay to receive for a period of time upgrades to your mobile's operating system, as well as security patches. Those upgrades and security patches are supposed to make your mobile phone more stable and less vulnerable to being hacked.
My understanding is that it is up to software developers (Abbott in this case with Freestyle Librelink) to ensure that their software is compatible with operating system updates and security patches.
You can of course change the settings on your mobile phone so that in future the phone doesn't update its system software automatically. Samsung are usually very good at walking customers through how to do that.
As long as you appreciate that not updating your mobile's system software when available may make your phone less stable and less secure.
I understand from other forums that the issues you have mentioned have also happened to other (non Samsung) Android mobile phones (Pixel), as well as some iPhones.
The current issues with no alarms and scanning issues also coincide with Abbott updating its Freestyle Librelink app twice: in November and December 2022.
Until Abbott fix the problems with Librelink, I am using their Freestyle Libre 2 Reader. You might want to consider using the Libre 2 Reader for the time being too.