charging when not charging

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http://forum.xda-developers.com – I have a verizon galaxy nexus and it just started acting up. Periodically, when not physically connected to a charger, the phone will wake up and say that it's charging. This sucks because it drains the battery. Could this have started due to the phone being exposed to high humidity? Also, there are lots of apps that keep the screen on, awake, is there any way / app that keeps the screen off, even if the charging state changes? Thanks. (HowTos)