I've got this problem as well. Everytime I try to load up a saved campaign mission, immediately upon loading I get a message saying my internet connection is experiencing problems and I must return to the main menu.
It can load mission files from the servers however so then how can my connection possibly fail?
Single missions work, it's just the campaign that fails.
I've got a legally bought SH5, patched up to 1.01, windows vista enterprise SP2
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