hey there!

I am a Nexus 5 user for a couple of weeks now, and I have a small problem:

During (some) calls, I can hear interference in the call audio, as if it was disconnected for a fraction of a second (the sound you hear when you unplug your headphones but still have them on, only a couple of times)

I replaced my sim card to a new one and it didn't help. The reception bar is full.

The problem happens even when I am using my headphones during calls

What might be the problem?

thank you!