If you go offline for 2-3 days. There is a chance that a peer you have a channel with could potentially try to share an old state of the channel that benefits him/her with more sats on his/her side than there really have. If your node doesn't go back online in time to provide a channel state that is more recent then they could get away with some funds. But you can set up a thing called a watchtower to automatically store channel states for you and send them for you if you are offline and a peer tries close a channel with you with erroneous info.