Reply to ableton forgetting automation?

im using guru as a vst.ableton 8.2.1 and when i automate the parameters in the midi track it works but then when i do other things and go back the automation has gone!!.it doesn't happen all the time but is obviously a head f%^k when it does.has anyone else experienced this or if so have a workaround for it.

i haven't posted this on the ableton website yet as this is my go to community but will look over there aswell.