i dont think 2dB is enough SNR margin for a long line. Is this a typo? If not it could be a misreport by the router. If it is correct it could account for the packet loss....except I'm guessing you have no packet loss when it says 2dB lol.
So, following the thought that the 2dB is correct, this would mean the signal of some parts of your data stream will get drowned out by any noise on the line. Noise is kinda random, can be generated by neighbours doing weird things, is higher when it is dark.
Interlacing means some of these drop outs can be rectified without you knowing (apart from lower speeds) but if the corruption of the signal is too great then the packet can be lost.
However, your packet loss at 10dB SNR, 45bD atten. and 1300kbps speed suggests spurious, intermittent and loud noise on the line, or some kind of bad, corroded connection.
I would say i feel 80% confident in my thoughts here, I welcome other interpretations of robby's stats.
In theory, theory and practice are identical.....in practice they aren't!