Could it be related to the CD player tripping up on some form of copy protection?
I don't believe that Pearl Jam disc has any copy protection. I know that the UFO disc doesn't.
My theory

is that at least for the Pearl Jam examples, is that there is a "timeout" for the 950 to lose the signal. If the time out was lengenthed slightly, should take care of the problem. (More time allowed when a signal isn't present before the 950 loses the lock in the 1st place.) But, might make *switching* locks from one source to another slower.