I've had my DX100 for a year now. I've been using it with the Unique Melody Miracle.
I have a few issues.
1) The battery life doesn't even last 5 hours now. Screen off, blank drive (so no background processes). Any help?
2) Sometimes playback gets strange. A problem I couldn't solve easily was when there would be intermittent random pauses for a second or two a few times an hour. Any help here?
Version 1.37 firmware.
As for the battery, I got this from the DX100 FAQ - http://www.head-fi.org/a/ibasso-dx100-faq
Getting the best from the battery
Keep wifi and bluetooth switched off unless you need them
Disable "Background data" option - this can be found in the "Accounts & sync settings" section from the Settings page'
you maybe want to root your DX100 and freeze suggested processes - also found in the FAQ
also, try to calibrate your battery