Sounds like you have some audio caching issues. I'd recommend cleaning out your files.
Unsubscribe from our packs. Then follow this list.
Step 1: Navigate to Steam/SteamApps/Common/GarrysMod/garrysmod/addons
Step 2: Select ALL files within this folder and press "DELETE"
Step 3: Navigate to Steam/SteamApps/Common/GarrysMod/garrysmod/cache/workshop
Step 4: Select ALL .gma files (leave the resources folder) and press "DELETE"
Step 5: Navigate to Steam/SteamApps/Common/GarrysMod/garrysmod/cache/lua
Step 6: Select ALL files within this folder and press "DELETE"
Step 7: Navigate to Steam/SteamApps/Common/GarrysMod/garrysmod/download
Step 8: You guessed it, select ALL files within and press "DELETE"
Step 9: One last time, navigate to Steam/SteamApps/Common/GarrysMod/garrysmod/downloadlist
Step 10: Select ALL files within and press "DELETE"
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