I’ve had my current e-reader for almost five years now, and I use it daily on my commute. Lately, it’s been freezing between pages, and I’m noticing a lot of “ghosting”—where faint text from the previous page stays on the screen. A hard reset only temporarily fixes it. Is this just a sign of an aging e-ink display, or are there other troubleshooting steps I should try before buying a new model?