Ending assaults/reinforcements without clicking?

I've recently been experiencing a strange and REALLY annoying phenomenon where I'm attacking or reinforcing and suddenly I can't... I scroll down and see that my assaults/reinforcements have ended even though I have not clicked the button. These are all in unlimited reinforcement games where I still had countries to attack or troops available to reinforce. Any ideas? I'm getting super frustrated as it is messing up my games
Any help would be greatly appreciated, thanks!
