today one of our customers WLC 5508 with code version 220.127.116.11 crashed. the uptime was around 50days and there we're no bigged changes since then.
from the crashinfo i can assume that the "EmWeb" process was involved in the crash... are there any related bug's to this process?
Open the Bug ID and compare some of the error message you have. They match.
Just in case, open a TAC case for a "second opinion".