David Shalita wrote:
Some roses are "nodders",
this meaning that the blooms are bigger than what the
stem can properly hold up.

I am positive that this nodding has occurred gradually and worsened
recently. Blossoms used to stand upright on very adequate diameter
stems.

Just a thought...

If it's getting worse and if (as you say) it's getting about 5 hours of
direct sun a day, is it possible that the shade has gotten worse over
the years. That is, when it goes into shade, is it being shaded by
trees that are growing larger, thereby increasing their shade,
shortening the duration of direct sun? Is it possible to prune (or cut
down) whatever is causing the shade?

Of course, if it is the house or some structure, then that's not the
answer, unless you can move either the rose or the house ;-).

As for a picture, I'd wait until you have another bloom and send one to
Allegra to post.

--
Henry