How can I diagnose and fix a cell phone freezing whenever it locks(manually or after sleep)?

My cell is a Kyocera Hydro Vibe (with Virgin Mobile plan). The "lock" function worked fine since I first got it months ago. Recently my cell started freezing whenever it goes into lock mode. I have to take out the battery in order to get it going again. The freeze happens if I lock immediately with the power button or if the cell locks automatically after going into sleep mode.
Is there a log file I can look at to see the cause? Any and all suggestions on how to proceed will be appreciated.
Android version 4.4.2

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