power issues(?) causing phone to resist powering on

Hello

I have an Lg V10 that i have not dropped and has no water dammage. Yesterday after showing no problems my phone powered itself off, going through the logos to do so (no sudden power loss). It was not plugged in at the time and i believe the battery still had power. it vibrated weakly as it shut down.

I have tested multiple batterys in it at various levels of charge and was able to only get a reaction every so often (3 times so far) the 1st got to the boot screen and crashed, 2nd got there and stayed there and i had o remove the battery, 3rd time let me get into the factory reset menu than crashed.

When connected to my computer it detects the phone and find my android confirms that it hasn't been powered on so i doubt it has screen issues.

I can charge a battery in it still so it is not the power in circuits (I think)

however even a full battery doesn't seem to change anything, is it possible that this is the power discharge circuit?

If you have any ideas on this i would love to hear them.

EDIT:

I managed to get it to the hard reset screen and confirm, i start to erase and it crashed after about a minute