Render previews disappearing from window

I realised today I have been putting up with this for ages. I’m sure the answer is simple but I have been unable to figure it out either by fiddling or searching.

I like to render to a new window. When I move my mouse near the controls at the bottom of a window the render image disappears leaving me with the grey grid.

This means if I try and use the Slots feature I have images disappearing and I don’t know what I’m looking at. If I render another image you are never sure which one you are being shown

If I then use the J key to go between slots all works well and I don’t seem to have the problem moving the mouse about.

Is it a bug? is it me? If anyone could enlighten me I would be most grateful

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