ARP issues on wireless - HP M479fdw

[DJL77]

Hi,

I have a HP M479fdw.  I have a single LAN at home with wired and wifi clients (on the same 10.x.x.x/24 network).

For the first several months, the printer was on a wired connection, and worked with no issues.

Then, I had to move it to wifi, and it became unreliable.  Occasionally, I would have a wifi outage (e.g. DHCP server which is root of wifi mesh network overheating).  I'd resolve the outage, and all my devices would be fine... except the printer, where I had to turn wifi off and on.  That was tolerable.  I had wifi direct enabled initially, but eventually disabled it due to spectrum congestion from all the wifi devices: it shouldn't matter, all my devices are on the same LAN.

Then, today, it just entirely stopped responding to ARP from most devices on the wifi.  It was still able to communicate with the router (10.x.x.1 -- the same device is also the DHCP server) and if I copied the MAC address seen by the router into another device (e.g. a Raspberry Pi on the same L3 network, or a Mac laptop), I had perhaps a 25% chance of being able to ping the printer.  I couldn't print documents I needed for my son's school work during his class: obviously, this was not OK.  In desperation, tonight, I connected it back to the wired network... and was able to locate it again from both of my laptops, and print what I needed to.  But, I had to place it somewhere quite inconvenient to use it as a wired printer.  Obviously, this isn't the reliability I thought I was paying for with the HP brand name (my HP Color LaserJet 2600n worked for many years, and still works today... except for occasional need to disassemble and clean toner from the internals).

I see occasional other threads about ARP issues on HP printers and no real resolution to those threads.  I don't want to factory reset and set up the address book and other settings again.  What should I do?

Wifi network is a mesh of several Ubiquiti AmpliFi HD products, and seems to be working correctly for the over 100 other devices connected.

[Repairatrooper]

Try forcing it to connect only on a 2.4Ghz channel of your wireless. I have seen compatibility issues with 5 Ghz