In the past, this would be a problem, but today it's not. Live casino software these days is programmed to let you reconnect without any downside to your experience. There is usually a 30-second window in which you can reconnect. However, these policies are different for each casino - some of them will send you to the non-live version, others will allow you to play if you reconnect on time, others still will make a default choice for you. Due to this, you must check what happens in each casino's particular offer via the casino customer support.