Thank you for the suggestions folks.
Better late then never, here is a quick update:
After trying many things (removing plugins, caching on/off....) suddenly my site went back to normal.
Since 4 days, it's under high load again. No changes where made. Logs show nothing suspicious.
Time to change the host I guess. I am moving to a VPS soon.
Hopefully this will fix the site performance.
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I know, my english is bad. But your german might be even worse
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