Quick note - Solid tips. I’d also avoid using an extension cord or power strip - voltage drop can slow the motor and make it overheat faster. If a deep clean and high fan/medium heat don’t stop the shutdowns the thermal cutoff or thermostat may be fatigued and and replacement is safer than repair. Also keep long hair and your hand clear of the rear intake; even a brief block can trip the overheat.
I've been through the same thing with my e-reader dying on me after a clumsy moment and and finding one that shines in bright light changed my outdoor reading game. You want something with an e-ink display that cuts down on glare and making pages look like real paper even under the sun. Battery life is crucial for those park sessions or trips, so aim for models that go weeks without needing a plug.
Portability means lightweight and slim, easy to slip into a backpack. And for your eyes, adjustable fonts are a must-have, letting you tweak sizes without strain. Check out options on that model that fit under $150, plenty out there with these features. Works great.