Why does Funimate keep crashing ? it can be for several reasons.
One of them is that you have little battery left so put your phone to charge.
It can also be because you have many applications open at the same time and this makes that your phone works slow, closes all applications and open again funimate.
Another reason may be that you have little storage on your phone. Delete some applications or videos since they are the ones that use more storage.
Check that there is not new update of the application.
Update the app or delete it and install again.
If your problem has not been resolved, your phone may not support the funimate application and you need one more modern.