When something occurs that is otherwise inexplicable; my first reaction is to restart the computer. If the problem continues, I will perform a cold boot (power down completely, wait several seconds, then boot). In my experience, that resolves most such occurrences.
I've gone past the restart and now shut down by default.
Shutting down not only cures all ills that a restart cures, it eliminates the potential need for a second procedure, i.e. a shut down after a failed restart.
Is there anything faulty in my logic?
