Repetitive indexing nd LOCK WRITE error

Hi,

Monitoring the Xapian plugin, I notice that dovecot is re-indexing multiple times the same Inbox for no apparent reason (not the last email received but the whole mailbox, LAST UID being properly returned (with the confusion already discussed) ) : Why so ?

Also, I get a LOCK on the "dovecot.index.log" file during this heavy indexing:

Error: Timeout (180s) while waiting for lock for transaction log file /data/mail/XXX/XX/mailboxes/INBOX/dbox-Mails/dovecot.index.log

ANyone can clarify the cause of this ?

Thank you