e420 electrical gremlin

[944s2c]

I was sitting in traffic today and noticed that all the instruments in the cluster were dead and the ABS light was on,and I could hear a humming noise.I switched the key to OFF and tried to restart but it wouldnt crank.Some of the lights in the cluster would not come on when I turned key to the ON position. Checked fuses,disconnected , reconnected battery,nothing.Then after several minutes I turned key to on(all lights in the cluster came on and I was able to start it and drive home like nothing ever happened.Any ideas???? The common link seems to be a dead cluster and no cranking from the starter. Any ideas would be greatly appreciated. Thanks, Dan