I accidentally held the two shoulder buttons while starting the GBA cause I turned it on while holding it in one hand.
I noticed that I wasn't able to boot into the program when pushing 'Start' so I turned the GBA on and off.

Then I noticed that my last three tracks got corrupted or rather scrambled together and scattered.
They were saved onto bank 37, 38, 39 and I think I even found bits and pieces of them on bank 29 and 2A that I think were empty before this strange incident.

The last three banks (37, 38, 39) where 'highest' in the list of available banks, the rest (3A -> 7F) are empty.

Someone knows what's going on and how to potentially restore this?

Thanks

Scanian Wolf