I just successfully reached your domain for the first time
1AND1 are basically a web hosting company which has a registrar arm. Their Registry Control Panel works awfully, when it works at all. So although you have registered a domain with them, their main focus is their hosting. As long as you stay with 1AND1, you won't have any problems, except that both their registrar and hosting are awful. You should be mindful that you must also, separately, close your hosting contract with them (for each domain registered), if you sell, transfer, drop your domain registration. The instructions for closing their hosting, is buried somewhere in their ToS, and is not that easy to understand. You are unlikely to succeed the close their hosting on the first attempt. Instructions for closing the hosting are obtuse and difficult. YOU SHOULD NOT IGNORE any hosting reminders. They will put their debt in the hands of debt collectors. Which will add collection costs and will ultimately ruin your 100% clean credit rating.
Nobody except mostly noobs use their services which they make then sound like good deals. But what you get is actually lousy services. Which you have already experienced. I would say that they are possibly the worst registrar/hosting company to get tangled up with. They make it extremely difficult to leave and will pursue their debts to the ends of the earth. Unless you follow their obtuse instructions and actually succeed in cancelling their hosting (on each domain, individually).
No domainer will buy any of your domains at 1AND1 unless they have mastered all the nuances at 1AND1. Which few will ever do, or master.
My advice to you would be to transfer every domain you have at 1AND1 to another registrar. NOW. And to make sure you close both the registration and hosting for each domain at 1AND1. There are millions of better CPanel hosts which will allow you to have a reliable hosting for multiple domains at a reasonable price.
Sorry for this bad news. Which probably comes too late for you. But maybe somebody else might be able to be put off ever signing up with 1AND1.