Well today the weather finally cooperated and my wife and I finally got some serious range time in. Number one on the adgenda was get the Red Dot Sight on the PS90 set up. Or so I thought. Sighted on the center of the target and squeezed off 3 rounds. Maybe they landed somewhere in the county but nowhere near the 25 yard target. After several 3 round burst I finally determined where the shots were going. Then when i went to fire a confirming " burst" there was no red dot. Turning the sight off after about 20 minutes i tried it and the dot was back but only for about 5 minutes. Everything is telling me (I hope) the battery is in need of replacement. Anyone else experience this or similar that was not the battery?