[OM] problem with OM4&cold weather

[asud journal]

Hi alls,
I've shot some rolls this week at a temperature of -5°-7°Celsius.
After develloping all the frames are half black or completely black.
It seems like a curtain problem but it works good at normal 
temperatures.
Did somebody on the list ever had this problem? What can i do ?
Loïc
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