I get like that too, I can email, text, but I just don't feel like talking. Mine goes back to when I was suffering from depression and just couldn't face a phone conversation. Sometimes I'd ring my buds back when I was in the right frame of mind and they wouldn't answer, because I hadn't answered them, then when they DID call I wouldn't answer, and so on it goes...I'm not suggesting you suffer from depression, but I do know where you're coming from. I just started telling my mates 'Look, I was busy/tired/stressed and couldn't speak to anyone, but I called you back,woman! What more do you want?! And making a joke out of it. It works...apart from the ones who think if they call a million times I'll answer! :)