SOLVED - Richard thanks for your contribution it has solved my problem and 
syncing now keeps going when on battery power as it did previously.
Not sure why this problem started after running K9 for a long time without the 
issue, but I suspect an update of K9, or maybe the Android O/S, reset the 
battery saving element of K9.
Thanks again.
For others, what Richard suggested was resetting the battery optimisation for 
K9 
You can get to this by: 
     - [android system] settings 
      - battery 
       - vertical dots (upper right) 
          -- select battery optimization 
        - "not optimized" pulldown 
            -- select "all apps" 
         - scroll down/select K-9 
          - set to "don't optimize" 
 

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