How to tell if your router or modem is failing

My modem restarts randomly and so does my wireless router. how to tell if they are failing and which one is failing? Cox came and said they checked the cables outside and replaced some old splitters. There is a change, but not much.
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More about router modem failing
  1. There isn't really a test to see if they are failing. Basically you just watch for things like what you are describing as them failing. Update your router to the latest firmware, and try connecting directly to your cable modem to see if you still notice it resetting. My cable modem used to reset, and it was because of an issue with the lines which it sounds like Cox may have addressed. How are you certain the modem is resetting and not just your router ?
  2. Usually you look for resets like the ones that are occuring, and dropped/lost/resent packets. Your router should have a stats page with this info.
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