Rhys,
You are not alone with this issue. I have been in the middle of an input and it wipes it all away which is frustrating but after 20 to 30 minutes it seems to be back to normal. It has been doing this for at least 3 months to me and I thought someone didn't like my material or because we are from the Waikato or something ! At least know it is not Ray's thread, perhaps it is " the Russians "..
Ken H.