Dovecot and MySQL aborted connections.

[Reio Remma]

Is anyone else using Dovecot (2.3.8) with MySQL (5.7) seeing a lot of 
these in MySQL logs?

2019-10-28T11:08:20.384428+02:00 58378 [Note] Aborted connection 58378 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an error reading 
communication packets)
2019-10-28T11:10:09.821171+02:00 58420 [Note] Aborted connection 58420 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an error reading 
communication packets)
2019-10-28T11:11:26.170015+02:00 58441 [Note] Aborted connection 58441 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an error reading 
communication packets)
2019-10-28T11:13:14.091426+02:00 58459 [Note] Aborted connection 58459 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an error reading 
communication packets)

They've plagued my logs for as long as I can remember. Is Dovecot not 
closing connections to the database properly or something similar?

Reio