Cracked screen can let in water very easily too :)
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Open it up and have a look :)
order a new screen and battery (that phone is probably in need of a battery anyway)
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To test battery, do a full cycle and recharge
Write down the % every 20 minutes with the phone idle, it shouldn’t drop more than about 3% per hour
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Then install a GPU benchmark and run on battery power, this is to check the battery can provide enough peak current when needed
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Then install a GPU benchmark and run on battery power, this is to check the battery can provide enough peak current when needed. If the phone shuts off or reboots during this test, the battery is no good