Why does my iPad always restart?

My iPad 1 has a greater problem. First it did´t recognize the SIM-card which is ok (tested). Sometimes it does, sometimes it doesn´t so I took the card out and run with WIFI only. Now it restarts uncontrolled by itself and I´m not able to activate it (after a complete reset). When I plug in the cable to activate it over iTunes it shot down by itself and restarts again. So I´m hanging in a loop...

What would you propose?

Greetings from Germany

Manni

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