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I managed to call Canon support this morning is here is what they came up with. The first things they suggested was disabling ECCO as described above so start there and if you still have problems...
The energy saving solution above worked for a while for me but failed after my printer had a long sleep. I called Canon Support and was asked to disable the Wireless LAN DRX Setting. It seems that the canon printer needs a certain port open to wake by default and this changes that. The issue was said to be that some routers close this port after it has been unused a long while. It didn't get more specific that this I'm afraid but hopefully this will help others.
To disable DRX Setting on Canon TS9120:
Gear icon on main screen (Settings) > Device Settings > LAN Settings > Common Settings > Wireless LAN DRX Setting > Disable
12/05/2023: New firmware updates are available.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.