Thanks to all for their responses. Thus far, it seems that once the leak is fixed, it doesn't occur again. Given the range of usage of those posted, I'd still be interested in others sharing their experiences as well.

Might be good to say when it was fixed and how many miles / years since then. Most have provided similar info, but it would certainly help to provide these details.

I'm hoping the new rings and design makes the return of this issue pretty rare.