Shutdown is a separate option
Formuler’s CEC guide lists Turn off with TV separately from Turn on with TV and Use TV remote controller. If the box sleeps or turns off when the television does, inspect the selected shutdown relationship before treating it as a crash.
Note the exact trigger and whether the same event occurs through the box’s own remote. This distinguishes a repeatable control command from an unexplained playback stop.
Revise the intended relationship
Use the box’s model-specific HDMI CEC menu and the TV’s documented CEC setting. Keep the other working choices in the record. There is no reason to reset the whole viewing setup merely to revise one linked-power action.
Test television shutdown and box wake separately afterwards. A working shutdown link does not prove the reverse direction behaves the same way.
Check the practical consequence
If the box performs another authorized task, establish its supported power requirements before changing linked behavior. Do not assume every app can continue background work after any standby command.
For support, state the selected CEC option and observed power action. This page explains Formuler’s documented controls without promising identical standby implementation across every TV or box generation.
Questions answered
Does turning off with the TV prove the box crashed?
No. Formuler provides that as an explicit CEC behavior.
Must I disable all CEC to change one relationship?
Inspect the separate supported options first.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.