Google Nexus 5 :: Very Low In Call Earpiece Volume After 4.4.2 Update

Black 16GB Nexus 5 here. My in call volume using the earpiece is very very low since the 4.4.2 update. I have the volume maxed out and have already cleared cache, and even data reset once. Did not work at all.

The only way to use the phone making a call is to use a headset or be indoors in a very quiet room. Even then it's hard to hear the caller using the earpiece. I always have to use a headset for making calls.

I remember the in call volume being louder before the 4.4.2 update. After the update, however, the microphone functionality is improved and people can hear me better now (compared to 4.4.0 stock). However, it's hard for me to hear them.I just wanted to see if someone else faced this problem or whether this is a manufacturing defect in my phone.