In recent months, my OfficejetPro 8620 responds to print commands from desktop Mac via wireless connection only about one out of ten times, with frequent delays. Icon displayed next to Dock Printer icon/window is yellow-triangle-exclamation-mark. Messages within printer status box vary; may say "connected to printer", "unable to connect to printer", "printing", "unable to get printer status", etc. Need help with how to resolve problem or work-around.
This could be an issue with the installed printer drivers or the connectivity. Let us try to isolate and resolve the issue-
Remove All Barriers: Certain building materials can get in the way of weaker signals like Bluetooth. Metal, bulletproof glass, concrete, and plaster are particularly bad, and marble, plaster and brick aren’t great easy. So if you’re really struggling with interference, your first step should be to move your Bluetooth devices away from these materials. That means no brick walls between you and your devices, and definitely no metal desks!
Change Router Channel: If you have an Apple router and you’re constantly getting interference with your WiFi, try rebooting it. Upon restart, the station will search for a new channel. Specifically, a different channel than the one your Bluetooth devices is using to communicate. If you don’t have an Apple router, you may need to instead go into your router settings and try changing the channel manually. Experiment with different channels to see which one works best.
Move Closer to Your Router: If you often find that you’re getting interference when talking on a wireless headset while on a WiFi call (you’ll know because you’ll hear static), try moving closer to your router. This will give you a more robust WiFi connection, so the Bluetooth frequency can’t overpower it.
Get Away From Microwaves and Fluorescent Lighting: Both emit frequencies of 2.4GHz, and moving away from them will distance you from the source.
To be able to assist you better, I would like to know the following:
Are the printer and PC connected to the same network?
Is your router dual-band enabled i.e., both 2.4GHz and 5GHz?
What is the distance between the router and the printer?
Is there any antivirus software installed on your computer?
Could you perform a ping test using the Mac Network Utility and let me know the results?
Use the printer IP address to perform a ping test, the printer IP can be located by selecting the wireless icon on the printer display.
The wireless status menu on your Mac should also give us quite a lot of information that would help us identify the issue. You can press and hold option-click the WiFi icon and then use shift-command-5 to take the screenshot. Press the space bar when the icon turns into a camera. Share the ping test results and the screenshot with us.
Also, check with your Internet service provider if your router is able to forward 'Bonjour packets'.
Bonjour locates devices such as printers, other computers, and the services that those devices offer on a local network using multicast Domain Name System (mDNS) service records. The software comes built-in with Apple's macOS and iOS operating systems.
Keep me posted for further assistance.
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