My solution is the following: uninstall all mods, go online in Steam again. Start game, close game (so it has refreshed), go offline and install all mods again. So far, I don't have any problems, hope my luck holds.
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Playing:
Windows 10 - Steam - Silent Hunter 4 v1.5
1_TriggerMaru_Overhaul_2-5
1_TMO_25_small_patch
RSRDC_TMO_V502
RSRDC_V5xx_Patch1
SCAF for RSRDC v502_2.0
IJN_Radar_Fix_2
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