Getting a lot of errors in Error Logs

[tatoline]

Hello,

My hosting firm email me: "Unfortunately, your website keeps producing high I/O Faults. It can be an attack or high traffic. You should optimize it or rent personel server instead of shared"

I'm sure that there is no high traffic since it's simple web site about physic in foreign language.  So it must different thing. When I check the Error Logs, I see that different IPs  have same 7-8 errors. Something like that:

IP	ERROR
10.190.200	error A
10.190.200	error B
10.190.200	error C
10.190.200	error D
10.190.200	error E
10.190.200	error F
10.190.200	error G
80.230.078	error A
80.230.078	error B
80.230.078	error C
80.230.078	error D
80.230.078	error E
80.230.078	error F
80.230.078	error G
45.120.54	error A
...	...

I attached the screenshot of the first page of the Error Logs on this topic.



PS: I started to use CloudFlare but the problem still exists. Hosting company check with SiteLock for malware but nothing. I updated to last version of SMF but no chance. (I don't know if it's about language file: Although I update it too, it's looking like little old. Here is a screenshot of versions: https://prnt.sc/myyw6x [nofollow])

[SpacePhoenix]

What version of PHP is the server running? What mods are installed?

[tatoline]

My current PHP version:  5.6
There is no mod installed. BUT, I changed a code in Display.template.php 4 years ago for sorting attachments alphabetically based on this message: https://www.simplemachines.org/community/index.php?topic=531408.msg3774097#msg3774097

Do you think this is the problem? Wasn't that file overwritten when I update the forum version to 2.015?

[Sir Osis of Liver]

https://wiki.simplemachines.org/smf/How_to_upload_a_fresh_set_of_files