Pebble Time Steel, button kept being pressed(?), battery life gone down the drain. Is a fix possible?

My Pebble Time Steel Kickstarter edition served me incredibly well from the day I received it till about a week ago. That's when I noticed it was set to the music controls and if I backed out of it, it would immediately go back, like the bottom button was being permanently pressed. That's when I noticed the light on that side of the screen had also given out, now when I shake the watch only the left side of the screen lights up. I tried pressing the buttons repeatedly, longer and shorter, to fix it and eventually it didn't switch to the music controls anymore.

The controls are fine now, all buttons work as intended, but the battery now lasts about 24 hours. A week ago it was still good for at least 5 days...

Does anyone know of a way to fix this, hopefully without opening up the watch or replacing parts. I don't mind the light no longer working but I want the battery to last 5 days again, it's one of the big reasons I've always used Pebbles.

Thanks!