Indy somethimes throws EIdOSSLCreatingContextError - multithreading

Question

I have a scheduled task that runs every 15 mins.
The scheduled task starts a multi threaded service that sends web requests to a web server. Sometimes, but not always, the TidHTTP.Post throws a EIdOSSLCreatingContextError exception. It's practically impossible for me to reproduce in a debug environment, but my log has 344 instances of the exception over the course of 10 days.
Here is the code that crashes, be aware that multiple threads can reach this code at the same time:
class function THTTPClient.Post(aUrl : string; aPayload : string;
aHeaderFields : TStringList) : string;
var
oHTTP: TIdHTTP;
ssPayload: TStringStream;
bSecure: Boolean;
sslIOHandler:TIdSSLIOHandlerSocketOpenSSL;
begin
oHTTP := nil;
ssPayload := TStringStream.Create(aPayload, TEncoding.UTF8);
try
oHTTP := TIdHTTP.Create;
oHTTP.Request.CustomHeaders.AddStrings(aHeaderFields);
bSecure := StartsText('HTTPS:', aUrl);
if bSecure then
begin
sslIOHandler := TIdSSLIOHandlerSocketOpenSSL.Create(oHTTP);
sslIOHandler.SSLOptions.Method := sslvSSLv23;
sslIOHandler.SSLOptions.Mode := sslmUnassigned;
sslIOHandler.SSLOptions.VerifyMode := [];
sslIOHandler.SSLOptions.VerifyDepth := 0;
sslIOHandler.Host := '';
sslIOHandler.SSLOptions.SSLVersions := [sslvTLSv1, sslvTLSv1_1, sslvTLSv1_2, sslvSSLv23, sslvSSLv3];
oHTTP.IOHandler := sslIOHandler;
end;
oHTTP.HandleRedirects := true;
try
Result := oHTTP.Post(aUrl, ssPayload);
except
on E:Exception do
begin
Result := E.Message;
raise;
end;
end;
finally
oHTTP.Free;
ssPayload.Free;
end;
end;
Eurekalog is used to log the errors. Here is the exception details:
Application:
--------------------------------------------------------------
1.1 Start Date : Tue, 5 Jun 2018 03:52:26 +0200
1.2 Name/Description: AutoRunMT.exe
1.3 Version Number : 7.12.48.94
1.4 Parameters :
1.5 Compilation Date: Fri, 18 May 2018 10:45:35 +0200
1.6 Up Time : 23 hour(s), 21 minute(s), 59 second(s)
Exception:
----------------------------------------------------
2.1 Date : Wed, 6 Jun 2018 03:14:25 +0200
2.2 Address : 006625DF
2.3 Module Name : AutoRunMT.exe
2.4 Module Version: 7.12.48.94
2.5 Type : EIdOSSLCreatingContextError
2.6 Message : Error creating SSL context.
2.7 ID : E99A7A81
2.8 Count : 1
2.9 Status : New
2.10 Note :
2.11 Sent : 0