playback lag on cubase pro 9.5

Hello to everybody!
Few day ago I tried to close a plugin. I don´t remember which one. There vas a kind of click and the audio was gone. I restart the comp and the audio was back, but there was playback lag also. Every function on Cubase has 1 second delay. Direct from transport bar or space bar from the keyboard, it is the same. It makes me nervous because I don´t know how to fix it. Until now everything was working perfectly. Maybe it is a computer issue or soundcard (Saffire56)? Did anybody have the same problems?
Thank you, people!

Hi and welcome,

Try to trash Cubase preferences, please. You can also try to reinstall Cubase. Last, you can try to reinstall eLCC application (the latest update, please).