[Q] Power Button Not Working

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http://forum.xda-developers.com – I recently upgraded from 4.2 to 4.3 (Slim Bean) and suddenly my Power button doesn't work well. When I press it, it doesn't wake the screen (not all the time, sometimes it does.) When I remove the battery and put it in, the phone turns on immediately without me pressing the power button. Sometimes the shutdown menu comes up randomly. In CWM, I can't select anything ( the power button was used to select things in the menu. Is it related to the upgrade, or is it just a coincidence of broken parts? Any advice/workarounds? Thanks! (HowTos)