To simplify, the hardware is sending some ACPI signals which tell the laptop to wake up. For some reason, sometimes they fire when you don't want them to fire.

To simplify, the hardware is sending some ACPI signals which tell the laptop to wake up. For some reason, sometimes they fire when you don't want them to fire. Incidentally I had this very problem when using Mac Os on a Macbook 2015 and I couldn't do much about it. When I started using linux on said Macbook at least I could disable ACPI signals. The first thing I do in any linux laptop I own is disable all ACPI signals and setup a script to do so at every boot. Then you just need to have a DE to suspend after X amount of inactivity (often the default) and you're set. Sure, you won't turn off/on your laptop by closing the lid, but it should work fine, turning on / off with power button.