Lately we started to see the mentioned exception from time to time on EG. For example here: https://evergreen.mongodb.com/task_log_raw/dot_net_driver_secure_tests_linux__version~4.0_os~ubuntu_1804_topology~sharded_cluster_auth~auth_ssl~ssl_test_netstandard20_patch_d8ab2f17e5880c279b64387cc43c03afd12d650a_60ae54bae3c3312c2ce7f91f_21_05_26_14_01_31/0?type=T#L2037. We should investigate the underlying reasons.