Lumia 720 Touch screen error

Hi everyone!
So, my lumia 720's touch screen is not respondig. I tried to reboot my pohne. The result is, that it was hard to enter the SIM PIN, because the screen won't respond again. After I succeed to enter the pin code, I had to enter my lock screen code. BUT: the lock screen is jumping up an down permanently...so it's impossible to enter the code...
OK, I've look after soft/hard reset...
I have done both of them...but still have the error... 
Anyone knows something?????????

gellrt wrote:
Hi everyone!
So, my lumia 720's touch screen is not respondig. I tried to reboot my pohne. The result is, that it was hard to enter the SIM PIN, because the screen won't respond again. After I succeed to enter the pin code, I had to enter my lock screen code. BUT: the lock screen is jumping up an down permanently...so it's impossible to enter the code...
OK, I've look after soft/hard reset...
I have done both of them...but still have the error... 
Anyone knows something?????????
sounds like a hardware problem. so when u mean soft / hard reset.. u already restore factory settings? still the same?
if you haven't yet.. try connecting the fone to the pc via usb.. so u may try to backup the files u have in there before clearing everything.
i have a 720 but that never happen to mine yet. it does hang a bit but i just power cycle the unit, she's good to go.

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