Canon MX870 network printer works sometimes

OK so I am in need of some help with printing over a wifi network.
I am using a Canon MX870 as a network printer with a Macbook Pro, and iMac that are connected to it via wifi. I also had it connected via ethernet and I still had the same issues. The printer does print but not consistently. It will randomly say that there is a communication error in the canon print status. I had the same issues with another HP officejet.
I am running the verizon wireless router and Mac OSX 10.6. Any help would be very much appreciated.
Thanks!

Given the current situation with the MX870 and the previous issue with the HP then I suggest you try changing the channel used by the Verizon router. Sometimes this can be done automatically by the router - simply restarting the device can be enough for it to obtain another channel. The other way would be to connect to the internal web page of the Verizon, by typing its IP address as the URL in Safari, and then manually changing the channel currently being used.
As to what channel to use, I suggest you get an application that can scan your immediate area to show what other wireless access points are close and could be conflicting with yours. There is a nice widget called Airlock that will show all wireless access points the Mac can 'see' and show what channels they are using. With this knowledge you can then select a channel that is not being used, or at least reply with what the utility finds and report this back.
The other thing you can check is the measured signal strength of the MX870. This can be found on the internal web page of the printer, which you access by typing its IP address into your browser. If you don't know the IP address you can use Safari to find the device, by opening the Bookmarks link in the toolbar and then selecting Bonjour in the left pane of Safari. The MX870 should be listed in the right pane. Selecting it will show the MX870 home page and here will be the quality and strength of the wireless signal. If these values are low then this will explain why you have been losing connection with the device.

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