I am having this issue on many macs now. Both my 13 and 15" Retina Macbook Pros and more. I've spent the last few months in frustration trying to figure this issue out, and had no idea it was related to this stupid friggin driver.
To prevent it from reinstalling after reboot, do the following
sudo kextunload /system/library/extensions/logmeinsounddriver64.kext
sudo rm -rf /system/library/extensions/logmeinsounddriver64.kext
sudo rm -rf /Library/Application Support/LogMeIn/drivers
There is a chance that if LogMeIn updates itself, it may drop the drivers back in place, which means you'll have to remove them again.
Now I have to go clean this off a ton of other friends Macs that I help manage. I'm sure they are having these same issues and not knowing what to blame it on.
FIX THIS NOW!!! THIS IS COMPLETELY UNACCEPTABLE!! YOU SHOULD MAKE THE AUDIO DRIVER AN OPTIONAL INSTALL!! Forcing it back after every reboot is WRONG!