Wi-fi weird behavior

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http://forums.androidcentral.com – I dont know if it affects sync or any other app while device is in stand by mode.. Sometimes when i wake up my gnex i don't see my wifi indicator and half second later i see wifi indicator pops out then it turns grey and only then back to blue mode. Skype icon turns to offline then back to online. Anyone experienced anything like that? Running stock JB 4.2.1 wifi sleep mode is always on. Thanks (HowTos)