The pillows started losing air as soon as 10-15 min

The pillows started losing air as soon as 10-15 min! Filling in air was easy but after following all instructions as mentioned, the pillow felt firm and full but just after 10 minutes it started to sag. I checked to see if the seal might be loose but it was well intact. The pillow has leakage somewhere. Did not use it for long as i ran out of breath, refilling it again and again

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