model.SaveChanges() hangs when looping over several small partitions

[casperlehmann]

I am running a loop over all the partitions I need to refresh. partition.RequestRefresh and model.SaveChanges() do the job, except every once every ten calls model.SaveChanges() just hangs. No error or anything. I am repeatedly testing on the same partitions, and it's essentially random which ones fail. The partitions are on the smaller side (it takes all but five minutes when it works), but I am currently waiting for a command that has run for 2.5 hours. What can I do to debug this?

Console.WriteLine("processPartitionInTable: Requesting refresh...");
partition.RequestRefresh(type: Microsoft.AnalysisServices.Tabular.RefreshType.Full);
Console.WriteLine("processPartitionInTable: Saving changes...");
model.SaveChanges();
Console.WriteLine("processPartitionInTable: Done");

I am running on a P1 sku Power BI instance. And as I said, these are small partitions at about 5-10 million row each. I don't think much else is happening on the server while I do this work.