ATF: Sundance - Outside windows

I have a outside window that exploded not sure how else to explain what happened. I have my 5th wheel parked at my house and noticed that the bedroom window was broken. Looked at it and does not appear to have been hit with anything. Has this happen to anyone else..
I do live in AZ , about 4 hrs northwest of Phoenix
Thanks
Bob Mansfield

Did it blow in or out

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The window blew out , no glass in the trailer.

May have been from too much heat inside the trailer I have seen it happen to cars No Ventillation and it gets too hot

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Lawn mower, threw a rock, window shattered but did not fall in or out, when door opened, incomming air blew it out. Don't ask me how I know.