I just bought a 2nd iPhone (4GB model) and am having a strange issue. If I put it on the charging dock, all is well and the phone will charge; but as soon as I take it off, the charge indicator remains set to "ON" and if I re-dock, it will not charge. I have to power the phone off and on to be able to charge again. Has anyone else experience this issue? What happens if a 4GB phone needs to be replaced now that they are sold out? Thanks.