I have had my Chargemaster for a number of years. I had one issue after the first year and RCBS replaced it. The unit has been flawless since. Last night I was loading some 300 Win Mag. I always manually weigh the first charge, then every 5 charges after that. The unit was throwing a consistent .5gr over on every single charge. The display would read the exact weight and then would beep to signal, everything was done. As soon as I opened the plastic cover, it would jump up to .5gr over. When I shut the cover again, it would stay at the higher weight. I rebooted the unit twice and calibrated twice. Same thing the whole night. I have a basement reloading room. I run a dehumidifier during the summer. Humidity was 60% last night in the room. I didn't seem to have any static issues(the powder did not stick to the side of the powder hopper), like I do when the humidity gets real low in the winter. Anyone have this problem?