Watchwinder question

[chicagowatchman]

I had a Orbita programmable watch winder for 20 years the Rolex president was set at 950 turns per day it died so I purchased a Orbita rotowind which swings the watch at 900 on the old winder I lost and sometimes gained 1second per day on the new one it lost 1 seconds per day for the first 2weeks the last few days it is loosing 2 seconds per day is this normal since it winds the watch rotowind