Email login problems with 1and1?

[ppppenguin]

My main email accounts are hosted by 1and1. This morning Thunderbird is failing to collect emails giving a "timed out" error. My Samsung phone is also failing to collect. All using IMAP so that emails are automatically sync'ed across devices.. 1and1 webmail is working so I'm using it for now.

Possibly a Plusnet problem as the phone received email OK when I switched off wifi to force it to use the mobile network.

Any ideas on diagnosis and fixing?

[ppppenguin]

Seems to be working now. Just one of those weird things you get with computers.

[Refugee]

There have been a lot of short gaps in the internet service over the past couple of months. These have been lasting anything between a couple of seconds to a couple of minutes.

[ppppenguin]

Internet was otherwise fine. Just email login giving grief.