Eseries / Communicators :: Nokia E7 Screen Static?

I've had a Nokia E7 for about half a year. it worked pretty well until the screen got cracked. It worked fine for a while, then the touch screen stopped responding. I got it fixed and it was working perfectly fine for about 2 weeks. i was using it one day, and it was eprfectly fine. I set the phone aside for a few minutes, then came back to it. I saw the whole screen was showing static, like when your tv has bad reception. i tried turning it off and on again, but it did not clear it up. I tried calling my number, and the phone rang. After about 10 minutes of curses and profanities, it cleared up again. About half an hour later, it became static again. Once again, after about 10 minutes, it cleared up. That night, i plugged the E7 into the charger, and the next morning, it was displaying static once again. i turned it off, intending to go see the shop. When i went, i turned the phone on, and there was no static. When he was checking it over, it went back to static for about 5 seconds, before returning to normal. When i left, i had walked about 50 metres when i reached to my phone to check the time. it was displaying static yet again. This was was about 5 hours ago and it has been displaying static since.