If you are seeing consistent CTD's then providing the following information is the only way the GWX team can ID whether the problem is something in the mod or due to a stock bug:
Mods running if any run on top of GWX2.0:
Year:
U-Boat type:
Flotilla & departing port:
Description of what happens immediately before the CTD:
Location and date that the CTD occurs
grid position and if possible narrow it down to corner of the grid. e.g.; NE corner of AM52):
ID of any enemy ships that are engaged when CTD occurs:
We can then use that info to try to narrow down what the cause is.