Ideapad Flex 5 CB 13IML05 

Serial ******

Manufacture Date 21/12/2020

Machine has started randomly shutting down, can be anytime it will show shutdown overlay then button presses itself and closes down.

Not sure if connected but when putting in password, the number 3 types 8 random numbers

Disconnected battery in case battery was faulty, still same running purely on main power.

Cant access long enough to get data /pics off machine and would really like to keep them

Dont want to powerwash or restiore without getting data off.

Anyone seem similar, does appear hardware and fatal.

MOD: Serial number removed as it's a privacy risk on a public forum. MTM is 82B8001TUK - Doc

Hi Bowmar, thanks for reaching our community. 

Were there any recent updates installed or changes prior to this issue? 
Please check the key if it's near the power button, there could be a stuck key or the power button is stuck itself.
Try cleaning it then check if you have same issue. 

Thanks,
Arjay_Lenovo

Hi Bowmar, if you still having this issue, please do the power wash, back up your files before doing it. 

Sign out of your Chromebook.
Press and hold Ctrl + Alt + Shift + r.
Select Restart.
In the box that appears, select Powerwash. Continue.
Follow the steps that appear and sign in with your Google Account. ...
Once you've reset your Chromebook:

Then if same issue after reset, please contact our service center from the link below .

https://support.lenovo.com/en/solutions/ht118678  
https://support.lenovo.com/en/supportphonelist  

Thanks,
Arjay_Lenovo