[Android] Resources folder: number of files limit?

Is there any limit on the number of files inside Resources folder(s) for Android? We have a game with 3 audio languages and around 24k audio files per language. We first had to split resources folder (having a Resources folder in assets root and another Resources folder in a different path), that worked with 2 languages. But if we add the third language the game freezes with a black screen when executed in the tablet. It stops happening if we remove around 5k audio files. Size shouldn't be a problem, black screen on startup persisted if we set maximum compression and lowest sample rate (reducing to around 600mb). Any ideas on this? We would like to publish just one apk with the 3 languages. Thanks in advance.