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I have two Sony Xperia XZ devices, bought both very recently in UK as used-with-warranty. One is working great, but the other (which has a 3 logo come up when booting) apparently has something using CPU all the time. Why I think so:

  • Phone is warm even when not used
  • CPU-Z and the like show frequency not falling under 1200 MHz, and usually over 1400 - while the other has it hovering under 1000 and sometimes hitting 330.
  • Antutu and especially GeekBench 4 results are worse than the "good" phone

So how can I catch the "perpetrator" and get rid of it? AVG and MalwareBytes scans find nothing. And the phone behaved like it was just factory-reset when I started it, so I'm not sure a factory reset would be of much help.

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    Use htop commandline tool to view resources usage at runtime. Or use GSAM Battery Monitor to view complete battery usage statistics. – Irfan Latif Nov 15 '18 at 21:35
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Use ADB and its logcat feature to see log of system and activity of processes.

Also you use adb shell top to see processes and consumptions

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