Korg edit button doesn’t always work ???

[sleepingangel]

There is no rhyme or reason. Is there something wrong with my volca
Drum. If I am in the middle of playing a grrove and want to change the sound of one of the parts and I press the edit button nothing lights. The only way it does it seems is if I shut down the machine and then before playing anything press it and then it lights and I can edit.
I just got this brand new volca Thai month
Please help
Thanks