@ofheartsking this can be caused by a bad battery. It may be report that it is charging but it can no longer hold a charge. Replace the battery then re-evaluate. The battery replacement on this is a PITA but it is possible. Since iFixit does not yet have a guide for it, check videos like this and this one as well as some pictures on here It is not directly about the battery but it will definitely get you there.
There are of course other reason that can be the cause but those are all board level repairs.
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!
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