I'm not aware of such hiccoughs. Could you please provide some examples that are specifically traceable to renewables? I mean excluding cases of general underprovisioning where renewables happen to be part of the energy mix -- this has been happening since before renewables were big and I reckon it will keep happening.

As far as the hard cap you mentioned, I think there's no danger of us hitting that cap in the next decade or so. Later on, maybe. Battery technology is also improving rapidly, so perhaps it will never be a true limiting factor.