Malfunctioning Cell phone?

I have an old Pantech P6020 that's around 5 years old. The service is off but I use it to make voice memos and videos and it's basically just a audible paperweight. It can't even use Wi-Fi. But its always on me. And tonight, I tried to make a new voice memo. Around 2 minutes long. When i did a playback test, it just sounded like static. Sometimes the recording messes up so I didn't think anything of it.

So I recorded another 2 minutes with the same result. After the third retry, I started to get suspicious and did some tests. I moved away from the MIC, Changed the volume, recorded only a few seconds, deleted files, renamed items, reset the phone, and even tried to change things in the settings and all I get is the quiet static. I don't know what the issue is. It's never done this before. Its always worked beautifully and there's not a single mark anywhere in it. The phone is still in good condition with a good screen, original battery, there should be no reason why only the recorder is malfunctioning. I haven't tried a video or picture yet since making this question but I intend to after I post this. Why would it be doing this and how do I fix it?