Trees and park can def cause some top sheet issues...
But you're right Wired, a general sweep of top sheet flaws are caused by other peoples boards.
I guess if you're thinking it could be a manufacture defect, post some pics LT
"When I do good, I feel good; when I do bad, I feel bad. Thatís my religion." - Abraham Lincoln
Moral of the story: If your going to rob people, wear a diaper.