**Both excess suds and a partial drain restriction are plausible. The key distinction is whether liquid water rises in the standpipe, or only foam escapes.** The late-cycle timing alone won’t distinguish them.

I’d check these possibilities:

- **Excess sudsing despite the “same routine.”** A new bottle may have a different concentration, the measuring cap may have changed, or the water may now be softer. Soap retained in towels and other fabrics can also build up over time. Splashless bleach is another possible source of foam. [Whirlpool’s suds guidance](https://producthelp.whirlpool.com/Laundry/Stacked_Laundry_Center/Stacked_Laundry/Washer_questions_or_concerns/Cleaning_Performance/Excessive_Detergent_or_Suds), [GE’s guidance on retained detergent](https://products.geappliances.com/appliance/gea-support-search-content?contentId=17820)
- **A developing restriction in the trap or laundry branch.** Reduced drain capacity could explain why an unchanged installation has only recently started overflowing. A main-line restriction becomes more likely if other fixtures also drain slowly or react during washer discharge. GE identifies rising water in the standpipe during spin as evidence of a household drain problem. [GE troubleshooting](https://products.geappliances.com/appliance/gea-support-search-content?contentId=17531)
- **Drain-hose position.** Check whether it has slipped farther into the standpipe, and verify insertion depth against that washer’s installation instructions. Keep the connection open around the hose; don’t seal it to contain the foam. [Whirlpool installation troubleshooting](https://producthelp.whirlpool.com/Laundry/Stacked_Laundry_Center/Stacked_Laundry/Washer_questions_or_concerns/Cycle_Concerns/Not_Draining_-_Washer)

**My first diagnostic would be to watch a full pump-out, then repeat with an empty washer and no detergent.** Residual detergent may require more than one rinse before that becomes a useful comparison.

If liquid backs up during the detergent-free discharge, investigate drain capacity and restrictions. Test at the washer’s actual discharge rate—a small bucket or low-flow hose test can miss a marginal drain. GE lists approximately 10–17 GPM for its washers, depending on type and discharge height. [GE drain-flow information](https://products.geappliances.com/appliance/gea-support-search-content?contentId=17516)

If water stays down and only foam climbs out, I’d start with detergent dosage, concentration, additives, and water hardness. My working hypothesis for the late appearance is that foam accumulates during discharge and becomes visible near the end; that’s a possibility, not proof of either a blockage or a detergent problem.