I’ve suddenly lost a lot of eyelashes, and I don’t know why

Hi! Some days ago I noticed that my lashes have become very uneven, as most of my lashes are much shorter than usual. For the past months I have not been doing my makeup often, so I know I’m not loosing them due to pulling them with and eyelash curler. Before when I have not worn makeup often my lashes ended up even longer than usual, and they’re usually very long. Does anyone have any ideas on what could be the cause, and how I could fix it? I have had problems with lash loss before, but that was due to using eyelash curlers too much