CPU and RAM do get older..
I could perfectly well rip on my (now dead) Thunderbird for a long time, and at some point exactly that kind of stuff started to happen. As for why it only closes the app, it might be adress range protection if the app produced a memory adress outside of the apps allocated adress space (ie because the hardware is now "a little bit" faulty) Windows probably will not like it if the app tries to access that adress and closes it.
Well that's just how i explained to myself the crashes i had back then. It started to happen a few months before the CPU serously started to degrade quickly. At this point it did not really seriously heat up yet (that came only later).
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-nyo
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