You could try turning off your phone, remove the SIM card and put in back in. Sometimes just re-seating the SIM will help. But if that doesn't improve things, like @Dannydet suggested, just take it into your local Cricket shop and have them look into it.
There is a setting that allows you to hang up by pressing the power button, make sure you're not pressing it during calls, or turn the setting off.
Go to
Settings
Call
Answering calls.
Make sure that the pressing the power key setting is off
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