I have a Dell U3818DW (latest firmware) and a MacBook Pro 15" (2018). They are connected with USB Type-C, so the monitor charges the laptop. Everything is fine, except that whenever I power off the mac (shutdown), after a few seconds / minutes it turns on again. I suppose the monitor keeps charging it and at some point wakes it up. Every time I turn off the laptop, I have to turn off the monitor too, or else after 1-2 minutes it is all turned on. This is especially annoying because I use a pc also on the monitor (on the HDMI port) and I cannot use JUST the pc, and turn off the mac, because it will continuously turn on. Anyone have any suggestion?

thanks