Ringcentral desktop app randomly logs out and crashes

I haven't heard about any other customers with this issue. Have you uninstalled and reinstalled the app? I know it's a common answer, but often addresses these kinds of one-off issues.
If this doesn't help, create a case with the Support team so they can assist in some troubleshooting.

If the Community team can assist, please reach out at Community.Support@RingCentral.com