There are at least two places in the SDAM code where exceptions are ignored. See:

https://github.com/mongodb/mongo-csharp-driver/blob/v2.7.0/src/MongoDB.Driver.Core/Core/Servers/ServerMonitor.cs#L127

https://github.com/mongodb/mongo-csharp-driver/blob/v2.7.0/src/MongoDB.Driver.Core/Core/Clusters/MultiServerCluster.cs#L229

To be fair, we don't actually expect exceptions in either of these places, which is why ignoring them hasn't generally been a problem.

However, any exceptions that might occur here due to bugs in the driver should not be ignored, so we should capture them and log them in some way.