Recently bought a v expensive Rodgers bedwetting alarm for DS8 and he's now wet the bed 3 nights running and the alarm hasn't gone off. He's waking up around 6 soaked through and no alarm sounds until he takes off pants and holds near alarm sensor. Everything seems to be set up correctly - green light on receiver thing, and alarm goes off when tested, just not when he wees. Anyone got any ideas what I'm doing wrong? Or is it just faulty? Possibly pants not tight enough, could this be an issue? 