I had this problem many months ago what I noticed was as the Russians were recapturing ports I would suffer CTD, but this never happen until the Russians moved forward.
No new info from me as I am testing a possible fix mod out, I will go back to the black sea some time.
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Dr Who rest in peace 1963-2017. 
To borrow Davros saying...I NAME YOU CHIBNALL THE DESTROYER OF DR WHO YOU KILLED IT! 
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