Folding while in insert mode?

I use foldmethod=syntax, but I'm finding it distracting to see the folds
changing while editing files.

e.g., with this code already in the buffer:

sub foo {
if (1) {
if (1) {
#blah
}
}
}

Starting up, I'll see:

+-- 7 lines: sub foo {-------

But, as I insert the following before that line:

sub blah {
if (1) {
#blah
}
}

The 'sub foo' section gets folded and unfolded to various levels (as the
syntax becomes invalid/different at different points).

Does anyone have a nice way to "freeze" the folds to their initial
values while in insert mode?

--
Best,
Ben

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