I recently upgraded my wireless router to a beefier device, and this has coincided with the packet loss disappearing from my BQM.
(I've retired an ASUS RT-N66U, generally considered obsolete, running RT-N66U_3.0.0.4_374.43_2-38L3j9527.zip.
Great wifi though. I now have another ASUS, a RT-AC86U, running Merlin's RT-AC86U_384.10_2.zip.)
My hunch is that the packet loss was in large part because I've a pi 3b+ running dslstats connected via the router by ethernet to
my Zyxel VMG1312-B10a modem, basically hammering the poor little router every minute or so.
(I have changed my mind about this more than once.) Another factors are the enormous amount of network rubbish that
some devices in my house generate. However, assiduously turning the bloody things off diminished the packet loss
by only a wee bit. Yes, I've actually got no convincing proof of my suspicions, but my BQM looks red-free now.