Sorry you are having problems. But, to me, it sounds more like issues with the lathe itself than the Reeves system. Reeves drives have been around for a long time because they give a relatively easy method of changing speeds compared to older pulley-belt drives. I used mine for six years before selling it to a professional turner. He was so pleased with it that he sent me, not one, but three, hand written letters thanking me for selling it to him. In most cases they are very solid and reliable devices that can work for years without any problems.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire