For the last three years, I've been enjoying my Canon MF633/635 laser printer.  But lately I've experienced a strange problem that I haven't been able to solve.

The printer has a connection to my home wifi network and it operates 100% wireless.  But lately, I can't scan a document and have it sent wireless to my computer like I used to.  But at the same time, I have no problem having my computer order a print. 

So in on instance (inbound) the printer functions correctly with a wireless connection, while it doesn't work in the other direction (outbound).

If tried turning the modem, computer and printer on and off, but that hasn't worked.  Any suggestions??