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Maximum number of connections from user+IP exceeded - dovecot error only one user

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I keep having this issue with one user, and I have to restart dovecot several times a day to clear it. What I have is a postfix / dovecot mail server (Centos 7) and about a dozen users. All mailboxes are imap. I monitor about 4 mailboxes on my computer and tablet. I use Thunderbird on the computer (cache connections at 2) and K9 on the tablet, but one user of the four I keep getting "Maximum number of connections from user+IP exceeded" and I have the maximum at 50 "(mail_max_userip_connections=50)" so its hard for me to believe I am actually exceeding it unless dovecot/client is not dropping connections and keeps starting new ones until it reaches the maximum, but again, only for one user, even though I am monitoring 4 on the same devices. Any idea how to troubleshoot this? I don't know if I should be looking at dovecot or the clients, or what I need to look for. It's been going on since I put this server in use over a year ago. Thanks!

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