log4net isn't logging at start, starts after a little time - log4net

Question

We've been using log4net in a .net console app. It used to log everything to console and SQL from the first entry. All of a sudden, the logger doesn't write to our SQL until much later, and it's weird, considering:
Logger.Info("my message won't log")
Logger.Info("my message will log")
it won't log the first but logs the second. Appears to happen every time at the same lines of code, still verifying that. I debugged, stopped at the first logger, used immediate window and log a message and that worked. Can't seem to see why.
But all the meanwhile everything is being logged to the console fine!
Thoughts on what could have happened or why?
Code for custom appender
namespace Dsmt.Logging
{
public class HistoryPatternLayout : PatternLayout
{
public HistoryPatternLayout()
{
AddConverter(new ConverterInfo
{
Name = "migrationHistory",
Type = typeof(MigrationHistoryConverter)
});
}
}
public class MigrationHistoryConverter : PatternConverter
{
protected override void Convert(TextWriter writer, object state)
{
if (state == null)
{
writer.Write(SystemInfo.NullText);
return;
}
var loggingEvent = state as LoggingEvent;
var historyInfo = loggingEvent!= null ? loggingEvent.MessageObject as HistoryLoggerInfo : null;
if (historyInfo == null)
{
writer.Write(SystemInfo.NullText);
return;
}
switch (this.Option.ToLower())
{
case "migrationhistoryid" :
writer.Write(historyInfo.MigrationHistoryId);
break;
case "itemid" :
writer.Write(historyInfo.ItemID);
break;
case "success" :
writer.Write(historyInfo.Success);
break;
case "message" :
writer.Write(historyInfo.Message);
break;
case "itemdatetime" :
writer.Write(historyInfo.ItemDateTime.ToString("yyyy-MM-dd HH:mm:ss.fff"));
break;
case "newlocation":
writer.Write(historyInfo.NewLocation);
break;
default :
writer.Write(SystemInfo.NullText);
break;
}
}
}
public class HistoryLoggerInfo
{
public string MigrationHistoryId { get; set; }
public string ItemID { get; set; }
public bool Success { get; set; }
public string Message { get; set; }
public DateTime ItemDateTime { get; set; }
public string NewLocation { get;set; }
public override string ToString()
{
var serializeObject = JsonConvert.SerializeObject(this);
//var serializeObject = JsonConvert.SerializeObject(this, new Log4NetDateTimeConverter());
return serializeObject;
}
public class Log4NetDateTimeConverter : DateTimeConverterBase
{
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
writer.WriteValue(((DateTime)value).ToString("yyyy-MM-dd HH:mm:ss.fff"));
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
return DateTime.Now.AddYears(-13);
}
}
}
}