Lock button not locking phone and sound thru earpiece really bad

Hi, have an iPhone 5, within a few months the lock button failed to lock my phone and during a phone call the sound thru my earpiece is really bad distorted and sometimes intermittent. ( not due to signal tho)
Are these common problems and will apple fix them or give replacement??
Many thanks

Well, if only a few months old then you are under the 1 Yr warranty that comes with the device, either contact AppleCare or visit an Apple Retail Store

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