We have a fairly new. We have a fairly new Canon Mp 620 printer that has worked OK until now

Question

We have a fairly new Canon Mp 620 printer that has worked OK until now though we have not used it muchWe are using it over a wireless network and have two macs that we also use over the wireless networkWe now cannot get it to print and have the following error message - our broadband connection speed drops a huge amount in the evenings - is that the problem??Error Number : 306 A communication error has occurred. Make sure that the printer is plugged in, powered-on, and properly connected to your computer. Then try printing again.