The screen goes off after some time of clockwork devterm operation

Hello!

Please, tell me what the problem might be: the clockwork devterm with the cm4 lite module is constantly darkening the screen after a while after loading and some time of use (5-10 minutes of operation). At the same time, the power button lights up green, if Cave Story has been started, sound is heard from the speakers. The devterm stops responding to button clicks.

Yours sincerely, Roman