If you are using the "Sleep when room is dark" feature, the Canvas might detect a "dark room" more frequently, even if there is enough light in the room.
To fix this, change "Light Sensitivity" to "High". If you're using the Scheduler, make sure the sleep events are not frequent, and also verify the time zone is correct.
If there is still an issue, please get in touch with us at meuralsupport@netgear.com