PSX problems

Hello. i have recently installed the 607 build of Lakka onto a Chromebox. I have the correct psx bios files with the correct hashes. My roms are in bin/cue format. However, it’s very hit or miss if they will actually play or not. Sometimes they will load up just fine. Other times i am taken back to the main menu with a “check file size failed” error. What can i do to fix this? Thanks.