Deccal I'm assuming you installed the latest stable version, 2024031300, which was released on March 13th. I checked the issue tracker and couldn't find any other reports of this issue. Maybe a developer knows about an issue that's not logged? I am not sure.
The model you're using doesn't get firmware updates anymore and can't be considered secure. If possible, you should get a newer model, preferably the Pixel 8 if you can.
Unfortunately, since you experienced this issue right after flashing GrapheneOS to it, I'd expect you'll have the same issue if you try again. You can try waiting for a newer release to try again, but if you continue to have the same issue, I'd suggest getting logs by following these instructions https://developer.android.com/studio/debug/bug-report#bugreportdevice, then you can submit them to the developers so that they may figure out what the problem is.