Output record file is sometimes corrupted (2)

Sorry for the duplicate issue but I wasn't able to comment the other one...

I just find out that ACR wasn't working everytime. Sometimes it can record the call without any problem but sometimes the output is corrupted. I belieave this is encryption problem since recording can work fine. I have attached 2 files, one is corrupted and the other works fine. My phone is a LG G2 on KitKat 4.4.2.