This is my 3rd dx recieved it yesterday morning put in freshly charged battery showed 20% charge did hard reset showed full charge..I went ahead and did factory reset.I then activated the phone noticed on android forum new update avialble so I went to settings and installed update phone worked great no reboots ,no problem making calls.I think they have os working good. Well this eveningI started to use phone and it says my sd is needing formated so I pushed format nothing happened.I shut down phone and pulled sd and reinstalled worked fine after that.Now if Ibump the phone it will start showing bad sd card and I can shake phone and it clears sd card and works finefor a few minutes and it says sd card might need formatted but when you tell it to format nothing happens.Ichecked it on laptop and reads good .Tryed it in wifes dx and it says ok.Is it possible the sd slot has to much play in slot?this is 3rd replacement.Has this happened to anyone else?