Why does everyone speed up in the piu sostenuto section of the G major Brahms violin sonata? Every single recording I've listened to, they piu the sostenuto for a couple bars and then when the triplets start they get themselves all in an inexplicable tizzy and all the king's horses and men couldn't rein 'em back after that.
So that happens, all the time, even fantastic violinists perpetuating this error, over and over until it's become common practice, instead of doing what's written: keep it sostenuto until several bars before the first theme, and then accel back into the recap. Makes so much more sense.
Not that anyone needed any more proof that Pam Frank is a goddess among mortals, but there you have it.