CPU is pegged at 200%, as it occasionally is. Log as requested attached.

=== output from `avahi-browse -rt _ipp._tcp` ===
+ wlp1s0 IPv6 oneprinting                                   Internet Printer     local
+ wlp1s0 IPv4 oneprinting                                   Internet Printer     local
= wlp1s0 IPv4 oneprinting                                   Internet Printer     local
   hostname = [HPF80DACD5800D.local]
   address = [192.168.50.133]
   port = [631]
   txt = ["Fax=T" "rfo=ipp/faxout" "mopria-certified=2.0" "Scan=T" "kind=document" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS600,SRGB24,OB10,W8,DEVW8,DEVRGB24,ADOBERGB24,DM3,IS19-1-2,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,application/vnd.hp-PCLXL,application/postscript,application/msword,application/pdf,image/jpeg,image/urf,image/pwg-raster,application/PCLm,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.m" "Duplex=T" "Color=T" "usb_MDL=Color LaserJet Pro M478f-9f" "usb_MFG=HP" "ty=HP Color LaserJet Pro M478f-9f" "product=(HP Color LaserJet Pro M478f-9f)" "UUID=d716b122-d422-5796-0cda-a6a1f122f436" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=20" "note=" "adminurl=http://HPF80DACD5800D.local./#hId-pgAirPrint" "txtvers=1"]
= wlp1s0 IPv6 oneprinting                                   Internet Printer     local
   hostname = [HPF80DACD5800D.local]
   address = [192.168.50.133]
   port = [631]
   txt = ["Fax=T" "rfo=ipp/faxout" "mopria-certified=2.0" "Scan=T" "kind=document" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS600,SRGB24,OB10,W8,DEVW8,DEVRGB24,ADOBERGB24,DM3,IS19-1-2,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,application/vnd.hp-PCLXL,application/postscript,application/msword,application/pdf,image/jpeg,image/urf,image/pwg-raster,application/PCLm,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.m" "Duplex=T" "Color=T" "usb_MDL=Color LaserJet Pro M478f-9f" "usb_MFG=HP" "ty=HP Color LaserJet Pro M478f-9f" "product=(HP Color LaserJet Pro M478f-9f)" "UUID=d716b122-d422-5796-0cda-a6a1f122f436" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=20" "note=" "adminurl=http://HPF80DACD5800D.local./#hId-pgAirPrint" "txtvers=1"]

=== output from `avahi-browse -rt _ipps._tcp` ===
+ wlp1s0 IPv6 oneprinting                                   Secure Internet Printer local
+ wlp1s0 IPv4 oneprinting                                   Secure Internet Printer local
= wlp1s0 IPv6 oneprinting                                   Secure Internet Printer local
   hostname = [HPF80DACD5800D.local]
   address = [192.168.50.133]
   port = [631]
   txt = ["Fax=T" "rfo=ipp/faxout" "mopria-certified=2.0" "Scan=T" "kind=document" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS600,SRGB24,OB10,W8,DEVW8,DEVRGB24,ADOBERGB24,DM3,IS19-1-2,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,application/vnd.hp-PCLXL,application/postscript,application/msword,application/pdf,image/jpeg,image/urf,image/pwg-raster,application/PCLm,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.m" "Duplex=T" "Color=T" "usb_MDL=Color LaserJet Pro M478f-9f" "usb_MFG=HP" "ty=HP Color LaserJet Pro M478f-9f" "product=(HP Color LaserJet Pro M478f-9f)" "UUID=d716b122-d422-5796-0cda-a6a1f122f436" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=30" "note=" "adminurl=http://HPF80DACD5800D.local./#hId-pgAirPrint" "txtvers=1"]
= wlp1s0 IPv4 oneprinting                                   Secure Internet Printer local
   hostname = [HPF80DACD5800D.local]
   address = [192.168.50.133]
   port = [631]
   txt = ["Fax=T" "rfo=ipp/faxout" "mopria-certified=2.0" "Scan=T" "kind=document" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS600,SRGB24,OB10,W8,DEVW8,DEVRGB24,ADOBERGB24,DM3,IS19-1-2,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,application/vnd.hp-PCLXL,application/postscript,application/msword,application/pdf,image/jpeg,image/urf,image/pwg-raster,application/PCLm,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.m" "Duplex=T" "Color=T" "usb_MDL=Color LaserJet Pro M478f-9f" "usb_MFG=HP" "ty=HP Color LaserJet Pro M478f-9f" "product=(HP Color LaserJet Pro M478f-9f)" "UUID=d716b122-d422-5796-0cda-a6a1f122f436" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=30" "note=" "adminurl=http://HPF80DACD5800D.local./#hId-pgAirPrint" "txtvers=1"]