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It is difficult to know what is causing your problem without being able to test it, hands on.
I have rarely seen a water pump "fail" or have an impeller detach due to corrosion or something like that.
The thermostat may be sticking closed too long; but this is something you would want to check using a diagnostic tool to watch the engine temperature. You could have a cooling fan issue also, or some other kind of engine issue.
