It's well known that some antiviruses and adblockers detect cryptocurrency mining scripts as malicious to PCs. Every time we unblock our script, a few antiviruses and adblockers implement improved measures of blocking it again in their latest release versions.
But we shall  try hard to have it unblocked as we are working to have a permanent fix for this problem.
You can try to use our AV friendly solution (if you were not using it right before) or else for the meantime, if you are doing solo mining in your website, you may try to add coinimp.com and hostingcloud.racing to whitelist in your avast AV. If it's collective mining for visitors on your website, you may consider notifying all users about the ongoing mining in your website.