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[Kumarsinh]

My mobile is automatically switched off and can't switch on

[CameronT]

Hi @Kumarsinh, welcome to the community. I am very sorry to hear about this  

When you connect it to the charger, does the charging light come on?

Try holding the power button and the volume up button at the same time.

[MarlonUk1]

hi @Kumarsinh

does your mobile try to boot up when it switches on

try to charge your device for 1-2 hours using wallmount charger

then perform software repair using Xperia Companion

[Lord_viridis]

If all the above fail, contact your Local support