That's just speed shift working. Clock speed won't degrade it, lots of wattage will so I wouldn't worry about it.
If you get a crash while overclocked it's likely the OC being unstable and nothing to do with the board.
What are you running at 4.8GHz overclock that is not stable, also what processor do you have? You need to increase Vcore for overclocking stability. Show a screenshot of HWiNFO of CPU and VRM temperatures.