Well that could be currents in the telescope OR it could be currents in the atmosphere. Both can clear up over time.
When you hear people talk about the "seeing" they are talking about the degree to which atmospheric turbulence is interfering with observing. I have had nights where I could get Jupiter up to 260X with no problem and get a pretty steady view. Other nights Getting past 180X seemed a real challenge as the image wavers in and out of focus.
The lower in the sky, the closer to the horizon the worse it typically is as you are looking through more atmosphere. But it be turbulent near the zenith too.
Since my scopes live at ambient temperature I know it isn't heat waves in the scopes.