Hi there hope i can be of assistance,
Ok i would first check the boot lock mechanism, make sure this isnt stiff/sticking as its common for these to be over worked causing the fuse to blow. Simply remove the boot trim to expose the rear of the lock assembly, and lubricate/check the link arms etc.
If this is ok, then youll need to have the current draw to each door actuator checked, or unplug them one by one until the fuse dosent blow, thus locating which door actuator is failing, causing the excessive current draw
if you need further assistance, let me know.