My mbp doesn't always wake from sleep when I open the lid

(mbp is recent thunderbolt version)
TItle says it all really.
Usually I can coax it back from sleep by closing lid and leaving for a minute a few times. Annoying.
Sometimes, briefly pressing the power button seems to give it a jolt and back it comes.
Hopefully this is a software issue and an update will rectify it. Please let me know if this is a hardware problem!
Thanks

oups .. wrong post. sorry ...
Parismatt wrote:
Usually I can coax it back from sleep by closing lid and leaving for a minute a few times. Annoying.
Sometimes, briefly pressing the power button seems to give it a jolt and back it comes.
Open Disk Utility and perform a permissions repair on your system disk, as updates and so on can mix the permissions on system files up.
Don't bother about upcoming warnings during that process. It's normal -> http://support.apple.com/kb/ts1448
After that, your system should work fine again.
Lupunus

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