Why is my lenovo laptop turns off by itself?

Model : lenovo ideapad 110 ( a year old )

Problem : sometime boots normally and sometimes not.

if sometime boots normally then everything works fine for an hour or less and turns off by itself (everything goes off power led and fan too). if i try to turn on the laptop it wont turns on for a specific time slice and if it turns on then again turns off by itself after lenovo boot logo again i have to wait for specific time.

troubleshooting : so i tried to remove my laptop case to see whether its a battery issue. once i disconnected my “laptop keyboard” from motherboard socket then everything works fine with battery and with AC power charger too. for to test the battery health, ran the laptop turned on for hours and battery backup lasted nearly 4 hours, so used the laptop with “USB keyboard” so external keyboard works fine. once i try to connect “laptop keyboard“ into motherboard socket my laptop goes to sleep mode and turns on by itself (power led and fan too turned off )doesn’t turns on till “laptop keyboard"is disconnected.

once the laptop turned off in that cycle - novo button or bios is not accessible.

Any one knows how to fix this issue ?

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