Help: When phone is on standby, i'm not getting any notifications of IMs/emails/etc

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http://forums.androidcentral.com – This is driving me insane because this seems to just started to happen tonight. And the worst part is this problem is inconsistent so I'm not sure what is going on. When I lock my phone and it goes into standby I test it out by sending myself an instant message through google talk/facebook messenger/email. Sometimes I will hear my phone ring and I'll get my notification instantaneously when the screen is off. Everything seems fine. I try the exact same thing 10 minutes later. I send myself another instant message/email and I hear nothing. No notification at all. I get bombarded by all (HowTos)