Olympus FL 36R Instruction Manual page 43

Q
Why did the FL-36R automatically turn off?
A
The FL-36R automatically turns off in RC mode and slave mode
when no operations are performed for 60 minutes. When connected
to a camera without communication capability, the FL-36R enters
the sleep mode if it is not operated for about 15 minutes. After
another 15 minutes, the power turns off.
43
EN