Hello Gazelle. I understand you are experiencing issues with printouts, and issues keeping the printer on a wireless connection. First, I would like to address the wireless connection part. This HP document provide troubleshooting that address a printer that can't maintain a wireless connection.
Once the wireless issue is resolved, try printing again. If the same printing issue occurs, try printing with a USB cable, to see if this makes any difference.
Please respond when you complete this troubleshooting. I will continue to assist you if necessary.
Mario