Sh*t Happens..
Hosted 100's of Domains and associated e-mail addresses on 2 Servers with 1and1 for over 20 years - exceptional reliability and service received.
Never lost a Site and over that period I doubt if we have seen more than 4 hours (total) e-mail downtime.
On the rare occasion that I have required assistance I have found their support services to be easily contactable very helpful and highly efficient.
Based on the above, I'm often bemused by stories I've read over the years as regards 1and1 crap service.