I doubt its the probe John (even though its a good thing to clean it),Originally Posted by 042126200F4E0 link=1277789942/0#0 date=1277789942
More likely, your water is low in dissolved solids (filtration?) and conducts a charge poorly. The mahcine thinks its run out of water and reacts accordingly...
I find that descaler does a pretty nice job of a probe when I do a Giotto descale ;)