Had my old faithful Z2 for a year now and the last few months have seen it randomly turn itself on even when the switch is in the "off" position. Happened in the middle of the night at CPPS, which led to the desolation of my pants as well as my team-mates... Only way to stop it is to take the batteries out, when it's doing the whole "possessed" thing messing with the switch does nothing. Could be related but sometimes the hopper won't turn on even wuith fresh batteries until I rub the batteries and/or disconnect/reconnect the battery pack. Anyone experienced the same issues or recommends a fix? Taking it apart as we speak for a proper clean.