Today I had some issues with Chromecast going slow, and it was because the Chromecast was too hot.
I put it in the freezer for 30 seconds which fixed it. If I get around to it, I might buy a heatsink for it. Maybe an old CPU one might be small enough, or the heatsinks you can get for “performance” RAM might be suitable.
This issue is perhaps only one that you get in hot countries.