At J Wells, I leave the liquid lines connected, but disconnect the gas. We have 10' lines so the pressure is around 10psi to pour (this is at 4k ft elevation). This does a couple of other things like not over carbing the beer, and if I have a leak, i only loose a half gallon or less.
I also cut the diptubes .5" for the liquid. you can degass the keg safely, and cut yours. Just be sure to clean and sanatize it before you put it back. i would also check your popit when you pull the tube and make sure it looks cool. Might as well replace it if its cheap. They are under $5 at my homerew store.