Hello,
I encountered the same wake-up issue recently on my MF8380Cdw, and this thread has been a great find. However I have not been able to locate the bandwidth settings through the Canon Remote UI webpage (or directly on the machine itself). Somehow the Canon Remote UI's menu I have accessed to is different, and does not fit the "SETTINGS then WIRELESS then GENERAL" description from a previous warp10too. Please kindly advise. Thank you.