Issues Receiving Mail via Thunderbird + IMAP on Bluehost

I have two email accounts set up with Bluehost for IMAP access, one of which I use to receive my DMARC reports. For over a week now (not sure of the exact date), Thunderbird has been timing out when trying to access both accounts.

Interestingly, one of these accounts is also set up for POP access, which is working fine. However, to view my DMARC reports, I need to log into the webmail interface.

I haven’t made any changes on my end, though it’s possible that Thunderbird was updated through the usual Ubuntu process and broke something. Has anyone else experienced this?