DTF peeling after washing

The wash was hotter than the sheet or the label. Xpres Evolution allow up to 40°C, inside out. A cotton cycle at 60°C is a different test. Use the cooler instruction. The washing page has the rest.
It was washed too soon. If your supplier says to wait 24 hours, a wash the same afternoon is outside their method. The Evolution page we checked does not print that wait. Follow the packet you have, not a wait copied from vinyl.
There was no second press. A first press can look stuck. The second press is what several sheets rely on for wash life. Evolution suggest 10–15 seconds. If you skipped it, that is the first thing to change on the next shirt, not the temperature.
The edges were never down. A seam, a damp patch or light pressure leaves the middle bonded and the outline loose. The wash finds the outline. That is a pressing fault. See not sticking.
Conditioner or a hot tumble. If the sheet says to avoid fabric conditioner, it is not optional. A tumble on high is extra heat the adhesive did not ask for.

Change one thing on the next test. Raising the temperature and the time and the wash heat together tells you nothing. The packet remains the instruction.

Common questions

Can I iron it back on after the wash?

If a corner has lifted and the film is still intact, a cover sheet and another press at the sheet’s temperature can sometimes lay it down. If the print has shredded or the adhesive has washed out, ironing will not rebuild it. Use a new transfer on a spare shirt.

It survived the first wash and failed on the fifth.

Look at temperature, inside-out, and conditioner. A 40°C limit ignored once may not show until the adhesive has been softened a few times. Evolution sheets say up to 40°C and inside out. Your sheet may be stricter.

Sources

Xpres DTF Evolution cold-peel sheets — wash up to 40°C inside out; second press 10–15 seconds
Xpres, how to DTF — pre-press, cold peel, second press, powder cured to an orange peel