Soft Touch Lamp Turning on by Itself
Since I can not comment I will post my comment as an answer.

I have a very similar sight (same?) and I have tried many things to 'fix' it. Finally one day I discovered that at the same time I pulled my back door closed (well, sort of slammed it) the light turned ON. Then the same action would also turn it Off. 

I knew both the lamp and the back door light were on the same circuit. I discovered that a few of the wires in both the light switch, back door light and where the lamp where plugged in were loose. (my house is 70 years old). After tightening all of the wires my lamp has never malfunctioned again.