@Nickodem ref

Hi, I use Raspberry Pi Zero with Recalbox on 8GB Sandisk's sdcard and sandisk 16gb pendrive which i use to boot and to have games on it (every game works fine from snes and nes). During the booting (from pendrive) it stops on black loading screen with these 4 pac-man ghosts. What am I supposed to do? I know that cleaning the pendrive and reinstalling it will help, but it often happens, I even changed the pendrive and it was still the same problem from time to time and it's very annoying. What should i do?
Please help and thanks in advance.