Serious Website problems

Dear support team,

I have been having serious problems with my website! Sinds i installed the Defender plugin and the Hummingbird plugin.

The problem is that my websites are having problem connecting to the server. I receive the following error message : ERR_CONNECTION_TIMED_OUT

After quiete a time my websites seems to go online, I have manage to De-Install the Hummingbird plugin but i cannot remove it because immediately my website goes offline.

And the biggest problem is that this issue is affecting my other websites that are not in my multisite network.

Can someone give this a look?