Sleep Interval not working

Nebula Capsule Max
Plugged in to power
Connected to Apple TV

The projector doesn’t turn off automatically and I can’t figure out why. Sleep interval set to 5 minutes. I have the Apple TV set on a sleep timer via Apple’s Home app automations. I also have a timer for the projector’s power cord that cuts the power at a certain time.

I’ll still wake up the projector saying HDMI no signal. Any ideas how to solve? I assume the battery is kicking in and projector is just hanging out in HDMI no signal mode for 5+ hours.

Pls help!