Probably your All-in-one PC doesn't have sufficient cooling for gaming usage. If it was a desktop you would be able to install additional or better fans or something, but I don't think you can do the same on such a system as yours.
IDK if you have access to the motherboard in this model, but if you have, try to remove the heatsink and wipe any remaining thermal paste and replace it with a better paste, like Arctic Silver, then of course but the heatsink back in place. This will improve the overall situation, but IDK if it will solve the problem completely.
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