Top Load Averages Always High

When running top the WD My Cloud always reports high load even when the CPU usage has been near zero for say an hour: (seems to hang around 3.X)

top - 19:13:35 up 2 days,  6:02,  2 users,  load average: 2.96, 3.02, 3.18
Tasks: 100 total,   1 running,  99 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.3 sy,  0.0 ni, 99.5 id,  0.0 wa,  0.0 hi,  0.2 si,  0.0 st
KiB Mem:    230560 total,   175332 used,    55228 free,    17656 buffers
KiB Swap:   500732 total,    17940 used,   482792 free,    76872 cached

The My Book Live and other Linux systems I have seen, drop the load average down to near zero when the CPU has been idle for a long while. This would appear to be a bug or maybe a hardware issue? Something is happening that is not CPU related perhaps?

That thread talks about a whole bunch of stuff, but the main point of your question is highlighted in that specific entry.