Phone call no audio

One of our users has a recurring issue of not being able to hear someone on the phone. It happens randomly and reinstalling zoom fixes it. Its not her audio devices and the weird thing is if we do a video call it works just fine. I have pin pointed the dll in question sipphone_audioctrl.dll when renaming to sipphone_audioctrl.dll.bak then closing zoom renaming back to sipphone_audioctrl.dll and opening zoom again the issue is resolved. I was hoping support could look into this. The file is in C:\Users\name\AppData\Roaming\Zoom\bin. Let me know if you can help at all.