3120 running crazy fast

[chiko323]

So today I got my 15300 in the mail and I have to say, its absolutely beautiful. Its my favorite watch I have ever owned. Unfortunately, im having a strange issue with it. I wore it all day and it seemed to be keeping very good time. Then later this evening I put it in its box and when I took it out an hour later it was running four minutes fast! I thought maybe it was a fluke so I reset the time and an hour and a half later it was four minutes fast again. I reset it and I put it on and its already two minutes fast after 45 minutes. I didnt know it was possible for a watch to be running so fast. Is it possible it is just magnetized or does it definitely need immediate service? Thanks in advance!
Justin