crwdns2934241:0crwdne2934241:0 Biren

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Device is restarting frequently. What is the solution?

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I have tried to repairing the software using Sony Companion but I couldn't  proceed for 'Next'  in the first option. And putting tick mark on 'My device cannot be started or detected', it completes the installation but same problem.

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Sony Xperia Z

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open