Related to software versions: 2.9.38, 2.9.40

I have noticed (twice) problem with command "/system reboot".
I have written:

/system reboot
Reboot, yes? [y/N]:

And I I have made a little mistake and I have choosed something like "H" or "B". The system was stuck in the processing the request. The processor load has increased to 100%. The only solution: hard reboot