Phone frozen for a short time after unplugging from charger When my screen is off and I unplug my Nexus 4 from the charger, the phone is frozen with the screen off for about 10 seconds. Power/volume buttons have no effect and the phone will not wake.

If the screen is on when I unplug, there is no problem and the phone is responsive.  This isn't really a big issue, but I'm just curious as to why it happens and what's going on with my phone during that time. Any ideas?
Do you use a nexus 4? This should not be happening with your phone as nexus 4 is quite a fast one. It happens with slow phones especially when you have battery saving apps installed. Try formatting your phone and deleting apps you don't need.