The issue seems to be caused by the printer contacting the Canon server to check for a firmware update.
I fixed ine by blocking the printer from accessing the internet in my router. It is accessible from my wifi netwrok but it cannot get to any sites outside my wifi netwrok.
If you do not know how to do that, or do not have a router that lets you do it, try this :
Pull the powr cord from your pinter to turn it off.
Temporarily turn off your wifi router or access point, to block any access to the internet.
Put the power cord bck in and turn the printer on, it should now start up properly.
In the menu, go to Set Up -> Device Settings->Firmware Update->Update Notification Settings and set to "Off". This turns off that feature in the printer.
Quit the menu, turn the printer off.
Turn back on your wifi, when it is back up and running turn the printer back on.
In this state the rpinter will be checking for any firmware updates from Canon. If that is important to you, when you think it is safe, go back into that menu and turn it back on again 😉
