Too bad,, repair or replace!!! What frame? Can you connect the crack with a specific incident or crash or is it just worn out stress cracking?
If you bought it at Performance, you might try taking it back there, although you may have invalidated your warranty by sanding it down like that.Its a 2013 Fuji Altamira CX 1.1. Not sure what happened there... maybe one of the kids got to it.... glad I tore it down though.
Doesn't matter where you bought it from, Fuji frames have a lifetime warranty for the original owner barring something like crash damage, misuse, etc. But as stated above you likely just waived that by messing with it. They have always been good to me, but are very particular when it comes to the requirements, i.e, photos, receipts, etc.If you bought it at Performance, you might try taking it back there, although you may have invalidated your warranty by sanding it down like that.