REF. 3706 Date Indicator Problem?

I recently acquired a Der Fliegeruhr Chronograph Automatic REF. 3706 as a hand me down gift. i read the manual and set the time correctly, according to the manual. i noticed that although the date indicator (number) does change at 12am the day indicator does not. it lags behind and changes around 5pm. this surely cannot be normal. any related problems? suggestions? I really hope the movement is not damaged :( keep your fingers crossed!
thanks

This sounds to me like a prior owner set the watch at s "forbidden time". You need to send the watch in for what most likely will be an overhaul. Sorry --don't shoot the messenger.

ouch..ok thanks for the heads up!