Realms kicks players from the server w/o saving, suspect on auto backup

Started disconnecting players every half hour or so. On reentry, world would be at previous save. Owner (me) could save and exit before the half hour and the world would save as demonstrated after the next disconect. I downloaded the realm to local, we played local, then I uploaded the world a few hours later. The problem went away for about a day but is doing it again. The problem going away may have been coincidence. I notice when it happens not when it doesn't. The problem has been going on for three or four days now. Only two people on the realm.