bk - I had the same issue with an older FW version and it was fixed after I upgraded to 1.03.12. Now I’m on 1.04.16 and I havent tried WPS again but it should be fixed in that version as well.
I upgraded my FW, reconfigured my wireless networks and then used WPS to pair the printer and SSID/Password remained unchanged as expected.
Reference the release notes for 1.03.12:
Fixed connecting through WPS function changes default SSID and Password
I purchased a new printer and when I connected it to the network using the WPS button, it changed the network name and blocked all devices off of the network. My password doesnt work anymore. I was able to get my laptop back on the internet by once again pushing the WPS button. But I cannot get all the devices back online like before. Any thoughts?