It is worth mentioning that I'm in Toronto, ON Canada, so hardiness zone 6a (edited from the previously typoed mention of 7a).

Is Toronto zone 7a now? - I thought it is 6a? - not that it makes much difference for the Aeonium :)

I don't have A. Zwarkop, but mine does that when thirsty. It took me a while to figure out watering - not to overwater, but little more than other succulents.

The leaves could also curl if too much sun all of sudden. But many succulents will wilt and they could burn if exposed to sun suddenly.

Are you actually using sun lamp?

As a refresher, here are the Canadian zones: National Resources Canada Plant Hardiness Zones.

It is normal for Aeonium to drop leaves. They go dormant in summer, so a little tricky for you in Canada, but they can be grown. Very minimal root system as they are native to Canary Islands where they grow in the cracks of cliffs and rocks and receive moisture from the atmosphere. Try bumping up the water a bit, light but frequent works here in soil outdoors, but as they go dormant in hot weather hardly any water at all. You might try just misting the foliage instead of bumping up the watering, but not in humid, hot weather.

@Rina_Ontario - you're of course right. I'll blame it on my fat thumbs and tiny phone - thanks for pointing out the typo though. I've now fixed it.

I was using a sunlamp periodically throughout the late winter / early spring when I was getting my sprouts started. I've now cut back on that and am taking them out for 2-3 hours a day on my covered west facing porch.

I'm going to give misting a try as suggested by @hoovb above. Now that in doing even more reading it seems like it is just a winter dormant plant which is so counterintuitive but also really reassuring !