Updated information on your radar. It took me a while to realize that this was my culprit but I believe I verified it with a few different restore points and step retracing.
Peek-a-boo internal drives:
Beyond orbiter notification that drives were "re-"discovered and ready to use that has been a mild annoyance for a while and partially resolved with changing the onscreen orbiter notification to "important." This issue is actually the disconnecting of internal drives routinely and quite often. While working with files using the media sync area of the admin page, entire drives black out and become unselectable. Leaving that area and returning finds the drive again or shows another drive black.
While on KDE desktop, all of my sata drives "flicker." Of my 4 drives, dolphin will show 1, then blink and show 3, then blink and show 2, etc. This "flickering" or rediscovery of drives happens I would say every 1-2 seconds. I dont know the frequency of your radar doing its sweep but thought that timing may be important for you somehow.
General system info:
Hybrid, 4 internal sata drives ( .16T install, .25T storage, .25T storage, 1T storage)
10.04 DVD latest install, frequent updates (typically pulling the latest from sqlCVS and update/upgrade every 2-3 days)
Last clone point where problem did not exist was the 23rd of June. Looks like I ran your patch on the morning of the 25th.