hi -
I've sent in a debug log regarding this issue which I'm seeing on one of my devices as well. The issue originally occurred last weekend, spontaneously resolved itself 2 days later, and recurred again this past weekend.
The problem seems very compartmentalized - I have two email accounts configured on a work phone using Aquamail. Both connect to the same IMAP mail server, yet only one account appears to have this issue which has lasted 3 days now. The account settings have not changed, the account is not locked out, and when the account is configured on my personal phone it operates correctly. The only difference between the two is slightly different phone models (both LGs), different cell carriers, and different Cyanogenmod builds - neither of which were upgraded or changed.
On the problem phone/account, I have tried rebooting, airplane mode to stop access/timeouts, deleting and recreating the account and reinstalling the app itself. The problem still recurs on this device. This is getting absurd. I can't leave this work account on my personal phone (mgmt will throw a tantrum) and the sheer volume of email per day (4 digits on a *good* day!) means it will eat my personal data plan in a week.
Any suggestion you have to mitigate the issue would be appreciated.