Please please please don't modify your hosts file unless you really know what you are doing. It can cause a lot of weird and problematic behavior, and may prevent you from getting to the site in the future if the IP address ever changes. This is not entirely unlikely, and by that point, you will likely have forgotten that the file was modified and be tearing your hair out because it works for everyone else.

Then what is the solution? To answer here costs my about 10 to 15 minutes. I get a time-out 4 out 5. I get 500 Error-Messages all the time.

I read lifein19x19.com mostly through my webbased rss-reader, where all works fine but as soon as i come here to search something or write something i lose a lot of unnecessary time...

Please, please change something. Is it the hoster? Are you using godaddy.com ... ?! Just do something.

While it is a risk, especially if the IP is likely to have frequent changes, the risk and problems will be very limited, and as long as you remember that you changed the host file it will not be any big risk.

(As a webbdeveloper in my professional life, my hosts file is filled with rewrites-.)

Although it is always best to avoid doing it. Though the sugested change to a stable IP would be the best solution. (Acctually the best solution, but probably too expensive is a ip to a load balancer, which then routes traffic to app-server(s). As 500 errors also can be code and speed issues. Also the fact that you get a 500 error means you reach the server, and the server logs should say what happened, so depending on what type of hosting, the log should be available))