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Vivoactive 4 discharges rapidly between 50% and 25%

I have had my Vivoactive 4 for a number of years. Over the past few months it has begun discharging rapidly between 50% and 25% battery life.  Between 100% and 50% and between 25% and 0% it is normal.  Is there any explanation for this and anything I can do about it?  I have tried restarting the watch.