@emanuele
66.102.8.247 - - [10/Jul/2016:17:21:51 +0000] "GET /railwire-broadband-review/ HTTP/1.1" 404 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.247 - - [10/Jul/2016:17:21:51 +0000] "GET /blog/ HTTP/1.1" 404 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.247 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?board=6.0 HTTP/1.1" 200 4682 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.130 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?board=8.0 HTTP/1.1" 200 4850 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.252 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?action=post;board=8.0 HTTP/1.1" 200 3650 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.252 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?board=7.0 HTTP/1.1" 200 4678 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.252 - - [10/Jul/2016:17:21:51 +0000] "GET / HTTP/1.1" 200 5105 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.130 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php HTTP/1.1" 200 5103 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.247 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?board=9.0 HTTP/1.1" 200 4717 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
66.102.8.247 - - [10/Jul/2016:17:21:51 +0000] "GET /index.php?board=4.0 HTTP/1.1" 200 4667 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko; Google Page Speed Insights) Chrome/27.0.1453 Safari/537.36"
77.75.78.169 - - [10/Jul/2016:17:22:55 +0000] "GET /robots.txt HTTP/1.1" 200 35 "-" "Mozilla/5.0 (compatible; SeznamBot/3.2; +http://napoveda.seznam.cz/en/seznambot-intro/)"
This is my server log when the issue was faced again...