Why has email automatic sync stopped working?

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Windows Central Question

My Nokia Lumia 620 CV UK, Cyan Dev Preview latest versions has decided to stop automatically syncing to my linked email accounts. Manual sync still works fine but no matter what period I set automatic sync to 1hr, 30mins etc. it no longer works.
Date and time are both correct. Due to backup still not working I am reluctant to hard reset the phone. Soft reset makes no difference. Phone is always connected to WiFi and has plenty of memory & storage free.