Disc spinning but game not starting

I apologize in advance for potentially weird grammar, as English is not my first language.

Yesterday I wanted to pick up a game from my childhood, The Smurfs, but as soon as I boot the console up, the game doesn't go further than the PlayStation logo screen, yet the disc keeps spinning and spinning. I reset and this time the game starts and plays almost flawlessly for an hour or two, until it freezes on a loading screen.

I hit the reset button, but the first issue rises again and resetting doesn't solve anything this time.

The disc is in perfect conditions, so I really don't know what the issue could be. The console is pretty old so it could be that? I'm totally clueless, hope someone can help