Diagnosis
The unit is likely overheating due to poor ventilation or a dirty condenser.
How to Fix It
Unplug it and let it cool down for an hour. Move it to a location with at least 4-6 inches of open space on all sides, especially the back. Use a vacuum cleaner hose attachment to gently remove dust from the rear vent grilles.
If That Didn't Work
The internal thermal overload protector might be failing, which requires professional repair. Contact Northair.
Heads Up
These are compressor-based units; they generate heat and need airflow like a mini-fridge. Cramming it in a tight cabinet will cause this every time.