by Why does my plumbing work better after several hours of no water use?
Short Answer: Temporary recovery often indicates a capacity or drainage problem rather than a permanent fix.
Detailed Answer: When water usage stops, wastewater levels may slowly recede through partially functioning components. The system can appear normal again until additional water use overwhelms it.
Related Questions: Can a septic system recover temporarily? What causes intermittent backups? Is my drain field becoming saturated?