Following the earlier loss and replacement of the screw holding the clasp/fliplock section of the bracelet on my TAG Link, the strap came apart again today, though this time at the other end of the clasp.
The reason - probably the worst quality springbar I have ever seen is holding this end together. I can only assume the spring has weakened with age because it was incapable of pushing both prongs out the ends at the same time.
I would advise other owners of this popular rep to replace the bar pronto with something sturdier. The bar is 9mm end to end not including the prongs. For a tip on how to remove the bar, as its ends are not particularly accessible deep in the holes of the bracelet link, see the attached pics