Rebooting is always a good first step to fixing computer problems

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As a former IBM engineer, I am the computer guru in our family, even though any teenager could probably run circles around me. But one thing I have discovered is that when things go unaccountably wrong with your computer, your first step should be a reboot. People don't realize it, but any computer nowadays is dependent of every one of its billions and billions of bits of stored information being in the correct state. If just one bit gets flipped in a sensitive place, perhaps because of static electricity, or a voltage surge from the power line, or just the vagaries of quantum probability, a running program, or perhaps the entire computer, can literally lose its mind. The way back to cyber-sanity in such cases is simply to reboot the machine. Then everything gets put back into its proper state. So, if your computer suddenly and for no particular reason starts doing things it shouldn't, don't panic. Shut the machine down, wait a few moments for power to go all the way to zero, then turn it back on. Probably 9 times out of 10 that fixes the problem. If a reboot doesn't fix it, that's time enough to panic.