We received the speedstir for Christmas 2019. It sees only occasional use as we only bring it out when testing TA and CH. It worked fine (probably used ten times) until this weekend. The bar doesn't spin consistently....it will spin for a bit then tumble around. Batteries tested 1.5V. Still tried different batteries with no improvement. Any idea what our issue could be? I see the warranty coverage from Taylor is an abysmal 90 days.