Left as a question even though it's a statement.
Let's make a fun post here.
2000 Points to the subjectively best response.
Without any indication of resources being an issue, or slow down in software, or the file needing to be saved... Without even the ability to submit a statement for why SW crashed _ which means that RX doesn't even register it as a crash.
Who can give the best reason why SolidWorks would close without warning?