Well I don't know if 3rd time is a charm here (as far as setup from scratch is concerned), but I set it all back up to gather the requested data in a different thread about a similar issue, and it's now working just fine. I really can't explain it... nothing has changed except a factory reset and going through the full setup yet again. All of the settings are again set identical and everything else, but now it's working fine.
I'll monitor the situation and report back with anything that I find, but I've put it through the paces as of this morning doing the exact same things I did before that caused it to crash (normal usage type of things, screen saver turning on, etc.), but it's working fine now.
I realize that's not helpful to those in this thread that are experiencing the same issues, but I don't know if it is just a matter of a factory reset after firmware update or what... but this is the 2nd factory reset I've done on the device (3rd overall setup from scratch), and now it seems to work fine.