System wakes up from suspension seconds after having been suspended

systemctl suspend makes system suspend, at least for a few seconds, then the system automatically wakes up.

The system used to remain suspended until a key on the keyboard was pressed or if the laptop lid was opened. After an update and a reboot the system started waking up only seconds after having been suspended, either by the command of by closing the lid.
Help is requested.

What was updated?

Ran sudo pacman -Syu so I guess everything

This will update every package for which there is an updated version. Not everything in the sense of each and evrey package installed in the system.

Look into /var/log/pacman.log to see what was updated before the issue started.

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Are you using a usb mouse? If so, you could try without that mouse and see if the PCs stays in suspend mode.

No usb devices connected