Brennan Sawdy

I recently bought a 2001 audi tt 1.8 turbo, the dash screen is pixelated, battery has been dying more frequently at random im not leaving and accesories on. And today my battery died so i roll started it and all my gauges stopped working. I shut the car off and back on a couple times and they went back to normal. Also the convertible top switch works probably 80% of the time and when it doesnt i turn the car off and back on and it works all of a sudden. Please need some advice