Rolex watch stops only when I wear it

Question

Hi I've had a Rolex Oyster Perpetual Datejust watch for approx 5 years and it has always worked beautifully. However I sent it for service earlier this year and since then it has not kept time. I have sent it back, it's been tested and even worn by a friend for a period of time and keeps time perfectly. If it is wound and I leave it overnight it keeps time; however when I put it on it immediately loses time. I am active, I am doing nothing different in my day-to-day activity than in the past 5 years so can't work out why its accuracy has changed. I have been very busy/stressed in my work in the last few months (maybe dumb question) but could this have 'altered' my kinetic energy????

I hope you can help. Thanks.