I have heard the following sentence in the TV series Marseille:
- J'ai des fourmillements dans la main en permanence. Sans parler des moments où elle me lâche carrément.
Context: A musician has recently discovered that she has a muscular degenerative disease in the hand which will soon prevent her from playing. A friend asks her how she is doing and she answers the above sentence.
What does "lâcher" mean here? I cannot find the correct meaning neither in the Larousse dict, nor in the Word Reference dict. "My hand really lets me go/releases me" does not make sense in English.