[General Maximus]

It means that there is sufficient noise on the network that it cannot sustain qam64 and has had to drop to qam32. Without looking up the exacts stats you are probably looking at something like a 12.5% drop in throughput so if for example the 4 bonded channels had a maximum throughput of 200mbits, that has now been reduced to 175mbits. Not the end if the world.