The JSON-RPC connection with the remote party was lost before the request could complete

Could you advise on finding a temporary fix for this problem? Is it related to my Internet connectivity / "phoning home", or a call between processes inside the system?

**System Information (please complete the following information):**
- Model Builder Version (available in Manage Extensions dialog): 16.6.1.2131904
- Visual Studio Version: 16.10.2

**Describe the bug**
- On which step of the process did you run into an issue: During training
- Clear description of the problem:
During training, I received error "The JSON-RPC connection with the remote party was lost before the request could complete" on 3 computers, some others did not with same training data but different settings.

**To Reproduce**
Can not be systematically reproduced.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Additional context**
1 of the computers had last iteration: 407 FastTreeOva ( no note about others )
It seems some of the computers also give a stack overflow notification related to a background task.

Log file can be delivered, but I am concerned it from a different run?
Systems have wifi connection to broadband router in case it is a call to the Internet.

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2021-06-27 11:59:56.5057 TRACE [Source=BinarySaver; Saving, Kind=Trace] Channel finished. Elapsed 00:00:00.5470290. (Microsoft.ML.ModelBuilder.Utils.Logger.Trace)
2021-06-27 11:59:56.5057 TRACE [Source=BinarySaver; Saving, Kind=Trace] Channel disposed (Microsoft.ML.ModelBuilder.Utils.Logger.Trace)
2021-06-27 11:59:56.5057 TRACE [Source=Saving Schema, Kind=Trace] Channel finished. Elapsed 00:00:00.5488603. (Microsoft.ML.ModelBuilder.Utils.Logger.Trace)
2021-06-27 11:59:56.5057 TRACE [Source=Saving Schema, Kind=Trace] Channel disposed (Microsoft.ML.ModelBuilder.Utils.Logger.Trace)
2021-06-27 11:59:56.5589 INFO Installing nuget package, package ID: Microsoft.ML.LightGbm, package Version: 1.5.5 (Microsoft.ML.ModelBuilder.Utils.Logger.Info)
2021-06-27 11:59:56.5758 INFO COMPLETED (Microsoft.ML.ModelBuilder.Utils.Logger.Info)
2021-06-27 11:59:56.6918 INFO

Code generated (Microsoft.ML.ModelBuilder.Utils.Logger.Info)
```