Dial *#9900# and select run dumpstate/logcat. When it's done select copy kernel log to SD card. When it's done go to My Files - internal storage - log. Everything you need should be in there. I rename the RR.e file to RR.txt so I can open on the devices and check system crashes. There's logs for NFC W/R, power off issues, battery stats, quite a bit. Have fun!