dovecot - Sep 2019 - Any need to be worried about occasional dsync errors ?

I am occasionally (maybe every 4 hours or less frequently) seeing the following
two errors appear in my logs.

Are they any cause for concern ?

Error: Timeout during state=sync_mails (send=done recv=mails)
I/O has stalled, no activity for 600 seconds (last sent=mail_request (EOL)