I ran spectrum scans of the sat approximately every hour from around 11AM thru after 9PM, and while there were some minor differences, the scans looked pretty much the same all day long. My quality did seem a bit higher in the morning, but not by a significant difference. I put the multiple images of the scan in windows on my desktop all in the same place, so I could switch from one to the other very quickly sort of giving a moving video of the whole days worth of images. There really wasn't a whole lot of change of any of the signals on the sat, pretty much just sort of the whole spectrum would breath slightly up/down a bit, probably more due to background interference than anything.
My real feeling is that problems like this are more often caused by other factors, such a like picking up variable interferrence from other signals, both terrestrial and from nearby sats, or from weather at the uplink or weather at your viewing location, or changes in temperature/humidity at the viewing location during the day, or even changes in line voltage at the viewing location. There are all sorts of possible causes of the slight variation in reception that are more likely than the issues being due to problems with the satellite or due to the uplinkers not knowing what they are doing.