Bought my first electric powder thrower. Chargemaster link. Normal lights, no windows open, no heat vents, level, calibrated, plug in to it's own dedicated line straight to electrical panel. Will not stop drifting. Have left it on a for a few days and constantly drifts. I zero it and it continues to drift rarely showing stable. Tried running powder throw it and it won't dispense powder unless it shows stable. I was able to get 12 charges from it over a 2 hour period. Most of those it would stop at charge and then once stable ot was a few grains over. Any suggestions? If not solved I'll be returning it in 2 days and replacing it with a manual thrower and beam scale