Nexus 4 in-call volume problem

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http://forums.androidcentral.com – I am having problems with the in-call volume of my Nexus 4. Say I have it at 4/5, it will remain at this for a while, however, it does not maintain this setting. When I answer a subsequent phone call, the in-call volume will have reset itself to 2/5. It is quite annoying answering a phone call, not quite hearing the person on the other side and then having to manually increase the volume again. I actually returned my 1st Nexus 4, however, this problem is now occurring on my replacement phone as well. Would anyone have any suggestions as to what might be causing this problem before I contact Go (HowTos)