win8 network problem

i have a synology nas connected to my home network, sometime win8 could connect to it, but sometime don't.  i've never had this connection issue with xp before.  anyone knows how to fix this or is this a bug in win8? thx.

I think this is a issue related to system stability
I have win 8 installed on a 2.5 HD, sometime it boots  up quick, but sometime takes doubt the time.

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