Salamander Shower Pump comes on periodically?

The pump insatallation is about a year old and has been fine up until the last few days, in fact it still operates fine when taps and/or shower are turned on. However, periodically it will turn itself on for about 10 seconds when no taps are running - perhaps every hour or so. None of the taps or showers are leaking/dripping.

Any thoughts would be much appreciated.

Andy C
March 2010