Stable? It is still rising or falling 5% or more pretty much every day. Even on days where it doesn't have that big a swing from the start of the day to the end, it is still having those swings within the day.
this is stable for btc patterns. Wasn't uncommon 50% or more range until somewhere before 2013. And these 5% are extreme values, with really few negotiations at these prices. If you don't count, say, the 1% higest value volume, and 1% lower volume, the spread will be way lower than that, I think 2% or 3%