Replying to Binding help

i was riding this weekend on my liberty's this weekend and i have some rosi binding on it and my boot came out two times once well riding switch and both boots came out. and a second time after doing a small jump on a trial only one boot came out that time. what should i do to fix this should i just change the din setting or is there something else wrong like the binding that im using or the boot or somthing? if i could get any help with this that would be grate thanks guys.