Hi FT,
You have been given some very sound advice about changing the fluid and as a vehicle technician for many years, this MUST be done as a priority. From the description given it is the most likley cause of your intermittent sponginess. To change the fluid is quite straightforward and cheap. Don't go looking for problems that may not be there. You are driving a vehicle which 'could' end up with brake failure - change the fluid at your earliest opportunity, then report back to us. If it's not worked then we 'the offerers of wonderous knowledge' will assist you further.
Hope this helps
Robin the Technician
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