Did a google search and one thing that came up was replication attempts to a server that was offline. Look at the log file and see what is going on when this messages appear. Also look at ini to see if nsf_buffer_pool is set and and debug parameters that you might want to shut off.
Feedback response number WEBBAUNJCS created by Barry Shapiro on 01/03/2018
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. . google (Barry Shapiro 3.Jan.18) 
