We have noticed that we receive erroneous updates randomly during the course of a trading day. For example, with 5-minute GOOG.O we received the following update:

It's almost 4 points below the previous trade. Here's what it looks like in our chart:

Here's the relevant code to create the log file I referenced above:

// Create the platform session.
using ISession session = Sessions.GetSession();

// Open the session
session.Open();

HistoricalPricing.Sessions[] sessionArray = new HistoricalPricing.Sessions[]
{
    HistoricalPricing.Sessions.normal, 
};

// Create a Historical Pricing stream - specifying the desired 'intraday' interval
string symbol = "GOOG.O";
var stream = Summaries.Definition(symbol)
                      .Interval(Summaries.Interval.PT5M)
                      .Fields("DATE_TIME", "OPEN_PRC", "HIGH_1", "LOW_1", "TRDPRC_1", "ACVOL_UNS")
                      .Sessions(sessionArray)
                      .Count(1250)
                      .GetStream();

// Open a file for output
StreamWriter outputStream = new StreamWriter($"C:\\Users\\coryschmidt\\{symbol}Stream.txt");

stream.OnInsert((data, st) =>
    {
        outputStream.WriteLine($"INSERT: {DateTime.Now}");
        Common.OutputTableToStream(data.Table, outputStream);
    })
    .OnUpdate((data, st) =>
    {
        outputStream.WriteLine($"UPDATE: {DateTime.Now}");
        Common.OutputTableToStream(data.Table, outputStream);
    })
    .OnStatus((status, st) => outputStream.WriteLine($"STATUS: {status}"))
    .OnError((error, st) => outputStream.WriteLine($"ERROR: {error}"))
    .Open();

If I re-request the historical data the erroneous Low disappears.