About once per minute, my computer asks me whether I want to activate Siri as in this other question. Per that question, I have enabled Siri then dis-enable it from system preferences -- did not fix my problem
At the same time, iTunes opens.
It just started about ten minutes ago when I plugged in my Kinesis Advantage Pro keyboard. Are these related and how can I stop Siri popping up continually after toggling the preference?