Samsung Galaxy S plus is becoming unresponsive when locked My samsung was working away perfectly yesterday and then was on my bedside locker when I tried to check the time the lock screen came up very faded almost its hard to describe but it was unresponsive otherwise e.g would not open would not turn off etc. so I pulled the battery (this may be bad for it I'm not sure) so I turned it on and it was working away fine but then I locked it and it became completely unresponsive, no lights nothing so I pulled the battery again and the same thing is happening.

Does anyone know whats causing this or a way to fix it. I'm hoping it's not serious as I just bought this 2 weeks ago!
If you're using a custom lock app, it may be to blame.  Try reverting to the stock lockscreen.