When you turn on developer options, and check display CPU usage, for me android.process.media is the top entry. When my phone was acting up, I just had a download icon and the word media on the battery usage stats. If you look closer at each associated thing that "Media" shows, they all lead back to android.process.media. If I understand correctly, pocket is causing this process to misbehave, using battery power when it's not necessary. I hope this helps.
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