There are two major problems users encounter when using wireless printers. One, suddenly the printer stops working due to signal irregularity, second, the printer refused to work using the network. In both instances, reconnecting to the wireless network becomes a classic case of guesswork,
simply because users never knew what caused the disruption of signal in the first place. Troubleshooting regularly starts with the local network, the device connection,
the power supply, and several others.
When a wireless printer suddenly stops, the network signal strength will be the cause, unless there is a power interruption. To simplify matters, the first line of action is to shut off the devices and allow a few seconds before restarting. In at least 70% of the time, this course of action allows the devices and wireless signals to reconnect and printing operation to continue.
However, if this action fails, then disruption could be caused by the following:
While working did the user changed or institute changes in the computer? 
Was there changes done on the wireless router and check for messages that can lead to correcting the cause of the signal disruption.
From How do you troubleshoot HP Photosmart D110 printer wireless errors?
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