I recently purchased a used 8 GB IPhone 5c off Amazon. For the first few weeks the IPhone worked fine and there were no problems at all , but now the phone will shut down and reboot when fully charged or get a blue screen/ and or colorful horizontal lines before rebooting. Sometimes the phone will automatically restart itself and sometimes I will have to manually do so. I have tried to drain the battery and recharge and have even factory reset the phone but all trys have had no success. Can someone please tell me what is wrong with my phone and how to fix it - thanks