Help with a buzz from Well Tempered TT

I've had the Well Tempered clasic with black platter and tone arm for about 9 months. Lately, a buzz has developed. I tried a new ground cable but to luck. When I tap on the cartridge and tone arm there is no change. There sometimes is an increase in buzz with turning the motor on or tapping the with from the tone arm. Unfortuately, I'm not in a town that has any store that has a repair service. All advice would be much appreciated!

Andrew