I got the news here:
https://busy.org/@holger80/the-account-nijeah-managed-it-to-freeze-the-entire-steem-blockchain
When I went to check, I had 284 new missed blocks which adds up to a total of 304. I am not entirely sure, how that happened. I am currently updating to the new stable version of steem, which should be 0.19.5.
Thanks @holger80 for letting me know.
I am working on the issue and my witness node should be back up soon.