JerryJoseph Hello mate, I’d suggest looking at battery usage and see if (a) any apps is draining your battery (b) any systems are draining your battery. I’d also suggest giving your phone a simple reboot. And, then if you experience this again, I’d suggest backing the device up & resetting the device.
If you continue to face issues, please submit a ticket with the Nothing Support team, this will allow them to help you in troubleshooting. You can do this by going to settings>system>feedback. Be sure to provide as much information as possible and, any troubleshooting steps you’ve taken.
Finally, please remember not to tag Nothing staff members, leaders, mod in your post. There’s a team of moderators here and the wider community that is here to assist, direct and ensure you get the right outcome(s).