Okay, that’s a standard cooling message. The Basic machines have an operating temperature range of from 60°F to 75°F. The machine heats up a few degrees higher than the air temperature around it when it operates, so if it gets too warm, the machine will Pause operations until it cools off.
(If you do not turn it off, the machine will resume the print as soon as it has cooled off sufficiently.)
What that means though, is if the air temperature is on the warm side, the pause is going to last for longer. The cooler the air around the machine, the shorter the pauses.
There are steps you can take to make a better operating environment for the machine here:
https://community.glowforge.com/t/stuck-in-too-hot-to-print/27259/8?u=jules