This has happened twice, upon wake from sleep 10.7.4 Lion changing my mac name
Why is this happening?
system info:

Why is this happening?
system info:
Hardware Overview:
Model Name: iMac
Model Identifier: iMac11,1
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB
System Software Overview:
System Version: Mac OS X 10.7.4 (11E53)
Kernel Version: Darwin 11.4.0
Boot Volume: iMac 27" 2TB HD
Boot Mode: Normal
Computer Name: iMac27 (4)