RPi3 wifi connection failed until I did an update

Not urgent as no longer a problem but…

I have been using a RPi with DAC hat as an headless sound only player for music every day. It connects by wifi to my relevant subnet and is in a fixed location in same room as wifi AP. It had been working without problems until a couple of days ago when the device, which is normally seen as a renderer on my control point, was no longer evident. I assumed some glitch on my network which had been turned off for maintenance so rebooted the RPi but no joy.
I connected a keyboard and screen and checked and some upgrades were suggested so upgraded and checked my control point and all is now OK.

Questions:-
I would like to understand why my system failed. I thought it had been set for auto updates but whatever I had set didn’t seem to do what was required. Could an auto update have been cause of loss of wifi connection?

After the upgrade I had a few error messages:-
Failed to start Raspberry Pi bluetooth helper. See ‘systemctl status bthelper@hci0.service’ for details.
This tells me it can’t init device hci0: Operation not possible due to RF-kill (132).
What is this about please and do I need to change something?

My second question concerned an error which appeared during the upgrade. I no longer have the info on screen but it concerned a problem with apt repo? Is any of this connected to my system failing?

Just wondered.

Further to my earlier post I have just upgraded a similar device and the message I have is:-
W: http://archive.raspberrypi.org/debian/pool/main/g/glibc/libc-dev-bin_2.28-10+rpt2+rpi1_armhf.deb: Automatically disabled Acquire::http::Pipeline-Depth due to incorrect response from server/proxy. (man 5 apt.conf)

What do I do to correct this please?

The filesystem may be corrupted.

Quite possible but I have quite a lot of time invested in this device and do not want do do a new install from scratch. Are there any simple checks I can do.
I believe the wifi problem has gone away but am not sure about the errors from upgrade.
This is no longer an urgent issue since I have my music back. If you have any thoughts on the upgrade issue please let me know when you have time.
Thanks,
Budge

First thing I’d suggest is taking a backup now.

Not particularly – we have filesystem repair logic in the initramfs. You could test the card with h2testw if you took a backup (block level) first.

Sam