It could be a thermal issue with your computer. I have seen computers that consistently lock up after a certain time period. The computer heats up enough and the lock occurs. It may be a hardware issue. I don’t think it is a bad mouse or keyboard or only one would stop working.
If you just use a browser surfing the internet, a cheaper and hassle-free option is buying a Chrome OS laptop that you can get for as little as $200 new from Lenovo (IBM previously), HP or Acer. The other option is installing neverware (neverware.com) now owned by Google for free home use on most any old computer. It is Chromium OS which is just the Open Source version of Chrome OS.
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