I have the same issue. It’s not mouse or smth like that, I turn off the mouse.
I noticed that it wakes up when it charges (I have laptop), f.e. if I suspend it and plug power cable off, it wont wake up and eventually will shutdown after couple of hours.
But if I keep my power cable in, it can wake up after 15 min or 20 min of being suspended, every time it’s different.
Any ideas how to fix it? Do you need some hardware info with inxi?