@tonypitts all of what you are describing, including "the back has a noticeable bulge in it" makes it sound like you have a bad battery. It might even be possible that the battery is swollen to the point of putting pressure on the case. You do want to go ahead and replace it as soon a possible before it does more permanent damage.
To work on your phone us the Moto G Power 5G XT2415 Level 2 Repair Manual that you can download from this page under the Documents Header.
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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