Hi Philip,
Yes, I have experienced a similar situation.
I have a Verdi Encore made in 2005. It has always been very sensitive to minor flaws and data errors on SACD discs.
Some of my SACDs are fine and play through with no problems.
Others cause an intermittent, jumping of the sound. It will dropout for 2 seconds then resume.
Sometimes it drops out, resumes, drops out, resumes several times.
Sometimes it drops out for longer and I can see the track time display scrolling upwards as it searches for readable data.
The worst times are when it comes to a complete stop. When it does that it is hard to regain control of the transport to restart or eject the disc. Through experience I have found that the only thing to do then is to cold-start both the Verdi Encore and the Delius. (In your case cold-start the Purcell also.)
If I don't do a cold-start any SACDs I play afterwards will jump or halt, even if they are not normally faulty.
After experiencing this for a while I became convinced that the base fault was with certain of my SACD discs (even ones that are bought new). If I look very closely at the discs I can see flaws in their surface or in the gold layer behind.
However, there is no doubt that the machine is extra sensitive to the flawed discs and doesn't seem to deal with the problem very elegantly.
Can other dCS owners confirm this behaviour in their machines?