Sketchup model not saving

My sketchup model is not saving. It saved up until 8/11/17. I had a microsoft update then but not sure if this is the problem. I have had 2 wasted days: the first I accidentally closed the model down and then found that it hadn’t been autosaving. I then started again and ctrl s every 10 mins or so and closed down and found that that too hadn’t saved.
I tried copying the file which at least has all the new work on, however that isn’t saving any new work on it.
The file is 25768kb - is this large?
I am using sketchup make 2017 on windows 10 and I am saving to a file on the computer
Thanks for any help

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