iPhone 5 rebooting fails/ shutting down

Hi everyone,

4 weeks ago my iphone startet to shut itself down with a display full of lenght stripes and getting pink and green. Sometimes in red , blue or green sqares. The it started working again but shuts itsef down 5-10 times a day again. i rebooted it, an it worked for 3 days "good" and then shut itself doen again.

Now i tried to reboot it nearly 25 times and it keeps breaking up in the middle of the software restoring process.

Yes, i have dropped it but it has worked perfectly after that! I never opend it up before and got it brand new from the store a few years ago.

I can´t find a solution and i tried dirfferet types of computers,macs, cables, usb plugs from friends and family but nothing really worked.

Has anybody experienced that, or similar or maybe solved that?Or has someone an idea to help me?