You're getting an OT waking. A 10 hour night is a classic OT sign. My best guess is that those hideous canines are starting to come in. Those teeth are bloody awful, worse than the molars in our experience! I think your child is getting a bit tired from those teeth coming in, and so is not able to sleep as long at nap and is having EWs.
I'd try an earlier bedtime to help resolve EWs, and then hopefully naptime will fix itself once waking is more normal again. Move bedtime up by at least 30 minutes, and perhaps as much as an hour. You'll need to experiment a bit.