Switch (Old) draining battery fast

[arquillos]

Hi, my "old" switch is draining the battery too fast!
The switch was completely turned off for 2-3 months. Yesterday I turned it on, updated to the new firmware (18.0.1) and find out that the battery discharges 30% each hour even with the switch off (waiting state).

Any ideas about the Issue?
Will reformatting the switch help?

Thanks!!!