Libcurl failed to receive handshake, SSL/TLS connection failed - ssl

Question

I had an issue for the last few days and the hosting technical team wasn't able to help me out, which is why I am asking here. Any information would be highly appreciated.
Useful Information
Software receives the "schannel: failed to receive handshake, SSL/TLS connection failed" error
Software runs inside a VM with a Windows 7 OS
Everything runs perfectly fine for 2-3 days and once the issue appears, every single VM on the host experiences the same error.
IF the issue is present it will NOT go away, until EVERY single VM has been closed. After waiting 2 minutes I can restart all of the VM's and they will work perfectly fine.
IF the issue is present I can't access the API inside the VM, but I can inside the host (same IP).
IF the issue is present and the VM has been restarted it will still receive the issue, until all VM's have been closed and then restarted.
IF the issue is present and open the website inside the VM I get a network error, but I can access any other website.
There is no Firewall or Proxy inside the VM that could cause this issue.
The issue doesn't occur on every host at the same time and doesn't affect others.
We are using the cloud services from Hostinger.
No errors appear in the php log file.
How the issue occurs
Everythinig runs as expected for 1-2 days without any issues and all of a sudden every single instance on the host receives that error. Other hosts are running perfectly fine, until their 1-2 days pass.
Fixes that we have tried
Changing Server Location
Changing SSL/TLS encryption mode to Flexible
Disabling/Enabling Universal SSL
Pausing Cloudflare & pointing DNS back to hosting server
Forcing different TSL versions inside libcurl
Checking if the IP has been banned/blocked
Code (Most likely not the issue, since restarting the software doesn't fix it)
CURL* curl;
CURLcode res;
std::string response;
curl = curl_easy_init();
struct curl_slist* headers = NULL;
if (curl) {
headers = curl_slist_append(headers, "Connection: keep-alive");
headers = curl_slist_append(headers, "Accept: application/json");
headers = curl_slist_append(headers, "Content-Type: application/json");
curl_easy_setopt(curl, CURLOPT_URL,endpoint.c_str());
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
if (patchOrPOST == "PATCH")
{
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PATCH");
}
else if (patchOrPOST == "PUT")
{
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
}
else if (patchOrPOST == "GET")
{
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "GET");
}
else if(patchOrPOST=="DELETE")
{
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "DELETE");
}
else
{
curl_easy_setopt(curl, CURLOPT_POST, 1);
}
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, json.size());
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json.c_str());
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 5L);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10L);
curl_easy_setopt(curl, CURLOPT_HEADER, 1);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
//IS FOR THREADING
/*
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
*/
res= curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
if (res!= CURLE_OK) {
curl_easy_cleanup(curl);
return "ERROR";
}
res= curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
if (res!= CURLE_OK) {
curl_easy_cleanup(curl);
return "ERROR";
}
res = curl_easy_perform(curl);
long http_code;
/* Check for errors */
if (res != CURLE_OK)
{
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
}
/* always cleanup */
curl_easy_cleanup(curl);
}
return response;
Error Response which occurs almost instantly after making the request
* Trying (OUR IP)...
* Connected to ourdomain.com (OUR IP) port 443 (#0)
* schannel: failed to receive handshake, SSL/TLS connection failed
* Closing connection 0
* schannel: shutting down SSL/TLS connection with ourdomain.com port 443
curl_easy_perform() failed: SSL connect error
Screenshots(Error was present on the host)
My question
What could be causing this issue and how could I receive better information or even solve this issue?