My boot experience during my ownership is -
Opened first time, did stay up 6 months in summer
Opened first time, Didn't stay up - Winter
Removed weight -
Opened first time, did stay up. - Summer
Opened first time, didn't stay up - Winter
Replaced with up-rated SGS struts-
Didn't open first time, Did stay up
Penny/rubber washer fix
Did open, did stay until another winter came
Adjusted Latch
Does open, Does stay up
Basically its a balancing act of all the above