Why does my MBP on Mavericks freeze whenever there is a Power Source switch?

As the title suggests, whenever I plug my MBP to a power source or remove the power adapte, the why system freezes for a while (30sec to 1min?).
After the freezing, everything is working again.
Does this thappen to anyone else?
Thanks.

Hi Aerithm,
Thanks for visiting Apple Support Communities.
If you're experiencing unexpected behavior when switching power sources, I'd suggest resetting the SMC first:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Best,
Jeremy

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