In my limited experience, "works for a bit then fails" usually means overheating. Maybe you could spray a can of compressed air or something to cool things down and see if that helps? (Could also help you "find" the amplifier circuit on the motherboard maybe?)
I have added a new BBcode to the config. I got annoyed at my meme images being FREAKING HUGE and so implemented this: [scaledimage={SCALE}]{URL}[/scaledimg] For example, here's a random image link from imgur using the [img] tags: https://i.imgur.com/zdOKeky.jpeg And here's the same image scaled down...