1. Check For Condensation.
  2. Tighten the Tee Bolts.
  3. Disconnect and Remove the Toilet.
  4. Remove the Wax Ring, and Install a New One.
  5. Reinstall the Toilet.
  6. Connect the Water Line.

If you fail to fix it, call R&R Murrieta Plumber to fix your toilet keeps running.