I have also faced issues in dice game for the ddos attack and lag. But I haven't lost anything for that. I think a lot of users has lost some good amount of money for the lag in various games. Stake team actually making those bonus drops as compensation for their users. This is a way of apologizing to their users for the inconvenience.
You can lose some money in a few games where you have to manually choose what to do after placing the bets. Due to the lag, You were not able to do that. But, If some users complain they lose their money on dice games due to lag, Would you believe this? I don't think the lag can bring you to lose the bet On the Dice game because the game is provably fair.