RAW HM1000X 35 Cal

Anybody have any issues shooting slugs out of a RAW HM1000X?
I shot it and got it sighted in very easily, then decided to try some slugs. After shooting a slug air kept escaping until I cocked it. After cocking the air quit leaking. Tried a couple more and had same issue. Went back to pellets and it still does the same thing. Afraid I am going to have to ship it back for repair, which is depressing as it is a new gun with less than 50 shots out of it.
 
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