Omega Seamaster Apnea 2595.50 Caliber 3601, low power reserve and inconsistent accuracy, does it need service?

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Dear forum members,

I own a Seamaster Apnea (2595.50.00) with the caliber 3601 which has an ETA 2892-A2 base with a Dubois Depraz 2029 Chronograph module (to the best of my knowledge and the limited info available).
Lately the watch started to lose 1 minute per day while having a power reserve of 2-6 hours (from being manually fully wound). When the watch has stoped, I though to activate the chronograph. Turns out that the when the chronograph runs, the watch is accurate from -5 to 0 seconds per day (as it used to be) and the power reserve is more than 44 hours (Omega advertised 44).
Any ideas why this happens (especially from @Archer )?

Many thanks 馃榾

 
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D D_M
Lately the watch started to lose 1 minute per day while having a power reserve of 2-6 hours
D D_M
Any ideas why this happens
Sounds like it鈥檚 time for a service.
 
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The watch is probably 20-25 years old now so if it hasn鈥檛 had a service lately it鈥檚 probably very overdue at this stage. Being a piggyback movement you鈥檙e probably looking at going with an Omega service through a boutique or something as parts for the chronograph module are not made available even to Omega certified watchmakers.