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I have had this self inflating mattress pad since June 2020 and slept on it most nights without issue. I was on it last night and it made an obnoxious crinkling sound and started to expand under my ass. I got up and was really confused and saw this big lump. It inflates with air first if I inflate it but stays inflated if I open the valve, and I need to push it down to get the air out. It is roughly the same size on both sides. If I keep blowing, it just gets bigger and bigger and it starts crinkling again.
Did a chemical reaction occur in my Mat? Did I sleep in one too many Indian burial grounds?
Is it kill?
