This morning, it woke from sleep again.
But just a few seconds ago, as I paged back to Page 2 of this thread and scrolled down, that's when I got the Display Driver error.
When it woke from sleep today, though, the external monitors remained off/unrecognized; I had to power them off and then on again for output to be restored. Once restored, I had to fix the taskbar height on my main monitor and SB.
Yesterday morning, I only had to adjust the taskbar height on my main display but what was different this morning was the Desktop text size for icon names was larger than normal (i.e., incorrect scaling). Usually when that happened in the past (prior to the firmware update), it meant that all my text scaling were incorrect (i.e., window menus, etc.) which necessitated a logout/login to fix.
But not today. I only noticed the Desktop text issue, but menus and other text had the correct scaling. I don't use the Desktop to store icons, so this is not a showstopper for me; I only noticed the issue because one app that I have forces an icon onto the Desktop.
One other anomaly that happened yesterday and repeated today was all displays blanking out. In both cases, I undocked and the SB screen came back and then re-docking correctly re-enabled the external monitors with their correct configurations.
Even with the above, so far I have seen a significant improvement in the stability/reliability of my SB--especially with my external monitors. This is not just due to the firmware update because I noticed some improves also after the hardware update last week.