I do not have pictures, however I have seen just the reverse: When first keyed, the spurs appear, then fade as the transmitter remains on. This is with or without an audio signal. Suggesting that something is changing as the circuits warm up? Thing is, I have seen this every time, even after letting the rig on for a period of time. I at first attributed to an issue with the SDRPlay SA, and that may still be the case, After reading your post, not so sure.