Phone Randomly Restarts - Possibly loose component?

Samsung Galaxy A50, randomly restarts. Still does so when:

• connected to power
• in safe mode
• after wiped cache partition

Able to replicate when gently shake up and down a few times. Feels as if the battery or a heavy component is moving in phone near the bottom.

I’m ordering a repair tool kit from Amazon tonight, think it could be a loose cable, loose battery, or loose dc adapter. Would really appreciate any advice or input.