Distributed Cache crashing under SharePoint 2019 running on WS2019

Adding mikeleemsft. Try running this:

Use-CacheCluster

# Stop the Caching Services on all cache hosts in the cluster.
stop-cachecluster

# Export existing cache cluster configuration
Export-cacheclusterconfig -file c:\temp\appfabconfig.txt

# make a copy of "appfabconfig.txt" and name it "appfabconfig2.txt"
# Edit appfabconfig2.txt
# Change <caches partitionCount="256" to "128"

# Import the changes.
Import-cacheclusterconfig c:\temp\appfabconfig2.txt

# Start the Caching Services on all cache hosts in the cluster.
Start-cachecluster

# Stop the Caching Services on all cache hosts in the cluster.
stop-cachecluster

# Import the original settings
Import-cacheclusterconfig c:\temp\appfabconfig.txt

# Start the Caching Services on all cache hosts in the cluster.
Start-cachecluster