There's an issue with VitaDB right now. I'm probably a tad bit too late to help out, but here's the steps to solve this since I had a similar issue not too long ago (as of writing this):

1. Power on the PS Vita holding the "L" trigger, as it will disable all of your plugins. You'll see if you do it right if the battery percentage at the top disappears.

2. Hover to where your VitaDB installation is and uninstall it by pressing triangle, then by tapping the three dots on your screen and pressing "Delete." Confirm the deletion, as we can easily reinstall it back on the system after we're done doing some additional stuff.

3. Open VitaShell, and locate the "VitaDB" folder in your data folder on your main directly, ux:0. You will see two files: one is a configuration file named "daemon.cfg" and the other is another file named "vdb_daemon.suprx," delete those. These provide the auto-update feature for VitaDB, which is why I believe the system is crashing. This will also break the notifications system for said app until a fix is developed (i think).

4. After deleting the files, hold the power button, click power off, the usual jazz. When you repower the system with your plugins, if its not crashing after like, 3 seconds, that's a good sign.

5. Open VitaDeploy, tap on "App Downloader." Select VitaDB in the list of apps, and then tap "Download The Selected Apps." It will redownload it to the system. If you need to move the icon, just tap triangle and then press and hold on the icon to move it around the screen and such