Emails sometimes don't show up

[duhmel]

Every few days, I don't see new email in my Thunderbird program. The emails show up on my iPhone or on Cox's webmail page. I use the Repair Folder trick and the emails now appear but a few days later the same issue comes back and I have to do the Repair again. I have deleted the .msf files to no avail. I'm looking for any new ideas.

[DanRaisch]

How is the account set up, as POP or IMAP? In Thunderbird the menu path is Tools->Account Settings->Server Settings->Server Type at the top right of the dialogue.