My issue is still ongoing also.
I was going to log in and check if I still can't get access to the link to manage my mailboxes, but today I can't even get that far;
This is the first issue I get when trying to log in;

close the browser tab and try again, and it's OK.
Then I get this;

Tried Chrome and IE - same problem. Tried lots of different links - keep getting the 'Bad Request' message.
Tried the PlusNet website - no problems, so don't think it's a local machine problem at my end.
I would like to find out about WiFi extension pods - but can't get reliable access to the website to do so!