directed 528t issues

im using a dei 528t to trigger relays to trigger the valves for my suspension to lay out the truck when the system is armed, im using the ground w/armed to trigger the 528t, ,y problem is ive burned 2 of these so far and am not so sure why they would keep burning, the 1st one lasted a couple months and burned a resistor on the board, (box is clear) and the 2nd one i just installed tonight and tested it 5-6 times and it also burned in the same spot, im drawing a blank here seeing as im using it to trigger relays, also i have a 530t window module that is using the ground w/armed to trigger the roll up but they are both diode isolated from eachother,any info is appreciated, thanx in advance....