My 8520 has a white screen, then keeps rebooting

Hi All, 
I have had my 8520 for about 18 months and it has worked fine.  Recently, I downloaded an app from app world and then all strange things started to happen.  (I am not sure if the problem is related).  It would freeze with a white screen or just go black and if I try to reboot it will start up and then freeze again.  at first It will only reboot properly if plugged into my desktop.  I tried restoring the OS and that didnt help.  Now, if it is plugged into the pc or wall charger it just keeps rebooting over and over.  The phone works when it wants and sometimes it doesnt.  It doesnt work for a whole day.  PLEASE HELP!!!

Hello mirs81
Welcome to BlackBerry Support Community Forums
Please Start your Device on Safe Mode and then Uninstall the Application You recently installed on your device . And also remove any media card if you have on your device.
 KB17877  How to start a BlackBerry smartphone in Safe Mode.
KB10040 : How to view or remove installed application on a blackberry smartphone.
Please try it and let us know.
Prince
Click " Like " if you want to Thank someone.
If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.
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