Rolled leaf on calathea

Woke up this morning to see my calathea "Second Chance" (the best ID I can give you) with about 50% rolled up leaves. It had been living happily in bright but indirect light, near a north window in a coolish (60-65F) room, with water about every 3 days.
Anybody know what's wrong?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.