DB Strings Breaking!

Well, I'm freaking out. Until this year I'd never broken a string. In August I got to a gig an hour from home and found my beloved Golden Spiral G had broken in the case. I was hearbroken and had to play a borrowed slab from a well meaning bystander. (The slab well, that's another story). So I ended up finding a Golden Tone G at some considerable expense and it's been a fine replacement. I got to a gig last Friday night and the G had broken again. So please help! The strings are breaking right at the ball end. I have a Thomastik tailpiece with 4 fine tuners. Any thoughts? I've got another gig on Saturday and I'm not inclined to invest in any new good strings or count on this bass for gigs until I've got some repair.

Thanks. Boom