I'm using the build 13A344 9 iOS - iPhone 5s and noticed some errors on my device.
1 - Sounds in all applications are dumb even when iPhone is in normal mode, forcing us to always increase the volume. Affected applications that could include: Instagram, Snapchat, Whatsapp, and Videos in the Camera Roll.
normal volume
after a while the volume is minimum (mute)
2 When it comes to 20% of battery into power enconomia mode. But we're very affected by not having more effect. When opening applications there are always small crashes.
3 When you press and exits from a power saving mode, the effects do not come back and we are required to disconnect and connect the device to the system to work with effects and no crashes as it should.
4- I have airport express and there is incompatibility with airplay, which forced me to turn off the airplay the airport express.
1 - Sounds in all applications are dumb even when iPhone is in normal mode, forcing us to always increase the volume. Affected applications that could include: Instagram, Snapchat, Whatsapp, and Videos in the Camera Roll.

normal volume

after a while the volume is minimum (mute)
2 When it comes to 20% of battery into power enconomia mode. But we're very affected by not having more effect. When opening applications there are always small crashes.
3 When you press and exits from a power saving mode, the effects do not come back and we are required to disconnect and connect the device to the system to work with effects and no crashes as it should.
4- I have airport express and there is incompatibility with airplay, which forced me to turn off the airplay the airport express.