I had this too, so I bypassed the tamper loop part of the contact and no more problem, can only think that the loop isn't very good inside the contact, this is the pair of white wires that are there only for a tamper
The Galaxy panel also doesn't always have enough power on the outputs to be seen by a auto dialler ect. you may need to fit a transistorized relay to get it to work
Have added myself to the map too.But have only put where i live as i cover all to the north and across to the west to Fort William then north from there.BIG service area.