There are currently many bugs discussed,here are some of them
1. Audio problem
The most discussed problem in the
Nexus 5 has been the audio. Users report the speaker is not loud enough,
and the audio quality is poor. The two grills at the bottom edge are
confused for speakers from the pictures but actually, the bottom left
grill is the speaker, and the right grill is actually a microphone.
Workaround:
There isn't anything from Google that fixes this problem as of now.
However, there are couple of fixes you can try. The most obvious fix is
to ensure you aren't blocking the speaker (bottom left grill) with your
hand. Another one is downloading a third-party music app for the music
playback, which unfortunately will not help you majorly but you can
tweak around with the equaliser settings. Else wait for an update from
Google to fix it.
2. Issues with the camera
Though
Nexus 5 features an 8-megapixel Optical Image Stabilisation camera
module, there are a lot of complaints regarding slow auto-focus, shutter
lag, blurry images and inconsistent colour reproduction in images. The
widely-accepted consensus on this issue is that the problems are not
because of the camera hardware, but the software.
Workaround:
While you have to wait for a camera app or firmware update from Google
for a long-term fix, in the meantime you can try third-party camera
apps.
3. Wi-Fi connection problem
An issue which has been noticed widely with the Nexus 5 is the Wi-Fi connection drop.
Workaround:
Simply switching Wi-Fi off and on, or toggling Airplane mode and back
again has been known to fix the problem for some users. Others reported
success after rebooting the phone. Another possible fix is via Wi-Fi
Settings. Here, select Advanced then select Wi-Fi frequency band and try
'2.4GHz only' or '5GHz only' instead of Auto, and see if that helps.
4. Power button problem
A few Nexus 5 users have complained about the power button making a knocking sound when the phone is shaken.
Workaround:
If the movement is slight, then it's normal, but if you find it really
loose, then you might want to consider getting the phone replaced. You
could also use a case for the phone if you don't get a replacement
device.
Nexus 5 also comes with a below par battery
backup, but there's not much you can do about it, unless you see erratic
behaviour (e.g. huge battery drain within no time). If you experience
such problems, you might be eligible for getting a replacement unit.