How to resolve Radio problem?

[user17]

I have a Lumia 520 and having some problem with radio lately. It was working fine untill one day it started playing through loudspeaker itself. Latter when i updated it to windows 10 using insider and reinstalled previous version using WINDOWS PHONE RECOVERY tool, it started working fine for some days. But now it's still the same problem. Any idea?
software using - LUMIA DENIM latest till today 20/07/15.

Thanks.