Music stops after the first track

[Hot 4 Myers]

I'm having this problem recently where, during any game (random map or campaign), the music start as normal but once the first track has finished, it stops playing. When I first load AoE, the music plays as normal on the first map I play, but after this I get the bug with the music. No idea why it happens, it was fine a few months ago, but the next time I play it's bugged.

All the other sounds are fine, it's just the music that stops playing. It's very annoying, seeing as the music tracks are so good.