Like the title says: Every time I reload, all the previous radio transmissions are repeating!

This was annoying the first time I played it but even more so since I saved the game at the start of a mission and loaded it today. The NPC is telling me stuff during a gunfight, but I can't hear him because ALL the previous radio transmissions are interfering! It starts with the explanations who the factions are, all the way to the radio propaganda after the last mission I finished. IT's HORRIBLE!

How can I fix this?