Problems with Fox Warrior bite alarms

Had them for over 4 years now and only just started to have a problem. They seem to turn themselves off when they get damp either from rain or dew. I have never change the batteries on them so could this be the problem do you think as the work perfectly in the dry? Anyone else had this problem?

Change the batteries mate then try them again

Tried that day after posting, they were alright dry but when got them a bit damp they didnt. Think i may have to invest in new alarms <!-- s:cry: --><img src="{SMILIES_PATH}/icon_cry.gif" alt="" title="Crying or Very Sad" /><!-- s:cry: --> shame, they served me well

Could just be wear and tare pal. You have had them a while and they are cheap alarms that do the job