False alarms with DSC wireless keyfob

Has anyone heard of this problem before ? I have a client with four
keyfobs (WLS919-433), one of which shows a low battery when dialing in
with DLS software (customer has a DSC Power 832 with the usual
wireless module on the bus). The client put the unit in a drawer and
in one day, when  he wasn't using it,  had two separate panic alarms
transmitted to the station  (confirmed with the station and showing in
the event log as well). The other three wireless units were not
present, being held by other family members who were not at home the
whole day

Could this problem be related to the simple fact that the battery was
low. If it is, it has to be the first time I have heard of this
problem as I have many other clients with the same setup......????

Any of you guys had this experience ?