veritas r8 constant tamper ?

hello .

i have a Veritas r8 alarm panel and keypad it has started buzzing inside and flashing outside when i stop the alarm it is showing tamper i reset the alarm and i noticed one day from the corner of my eye it had gone off and i was quite releaved but as i was looking the tamper light just appeared it didnt go off seconds later it did it was fitted in 1996 and 5 years ago it did the same as now i was prepared to leave the alarm switched off but there was a battery backup on the bell so i switched it back on started using it and it never tamperd again i have checked EVERYTHING sensors bellbox streched springs panel and fuses ive changed the battery ive powerd down again but still this time the tamper is not going can any one help me resolve this problem

brian
January 2010