One of the stratum processes for the multiport was misbehaving. There's a bug where occasionally a stratum process will get into an odd state where it won't die or drop the connection, but doesn't continue providing work either. We run around 10 stratum processes in a load balanced configuration just for the multiport, so roughly 10% of miners would have seen the issue.

It has been fixed now, and we're working on adding detection and automated recovery to fix that in the future without manual intervention.

@Laser-10012 Can you please email support@ipominer.com? We'll look into it for you there -- just include your username and a transaction id if you've received one.