Temperature of liquid at bottling, amount of head space variance, improper initial fit, improper storage, ............there are many things that could go wrong.
I was happy to see the remark above about the bottle variances. My company has sold corks, bartops, or capsules for twelve years now. And truly about 90% of our closure or capsule related problems come from glass inconsistency. The rest are random and sometimes a rare bottling error.
We offer the service of taking a look at your new favorite bottle to see what works. The only thing I can say is don't push the range for fit on anything. Stay in the middle. Bottles can stray from the drawing more readily than a cork, bartop or capsule/ sleeve can. A pair of digital calipers can be very useful.