Error mailbox: Sync failed

[Elise]

Dear team,

Lately I get these messages randomly in my logfile:

imap(elise)<68480><3asBXUG9A9hSsH9H>: Error: Mailbox INBOX: Sync failed 
for mbox: UID inserted in the middle of mailbox (186165 > 186164, seq=4, 
idx_msgs=4): 1 Time(s)

I use IMAP for Outlook 2019 and Thunderbird clients simoultanious icw 
Dovecot 2.3.13
Can you tell me how to solve this issue? thanks.

/elise
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