Thank you Ztcoracat for your reply. The link that you posted I had already visited but unfortunately didn't help me solve my crash problem, but did give me a couple of hints on where to look for potential problems.
Regarding the unattended crash, I inadvertently solved it while messing around with my screensaver settings and changing it from an actual screensaver to a blank screen. Since changing this setting I have no longer had any crashes.
Regarding the ACPI Error, the syslog still has a tremendous amount of the same errors as mentioned in my previous post, but they do not seem to be related to the crashes as I had previously thought.
Regarding the large amount of "Network Authentication Required" windows upon opening my laptop and unlocking the screen, this problem still exists and will be my next project to try and solve. I will be creating another post regarding this as I feel it is unrelated to my original post title.