Strange behaviour around fs.statSync

Just tried to reproduce syncStat problem in a different way. Typed commands in terminal window:

• reset()
  
• require("fs").readdir()
  
• require("fs").syncStat("Juergen1_data.bin")
  There is no response from Espruino, so I
  
• closed connection
  
• clicked connect button and got an empty list, no COM port available anymore
  
• wrote these lines and about a minute later, a Com port is available
  
• tried to connect and got Connection failed
  
• unplugged Espruino Board from USB
  
• plugged Espruino Board
  
• now connect worked fine
  
• syncStat worked fine
  Hmmm, whats that ? So tried again:
  
• reset()
  
• require("fs").readdir()
  
• require("fs").statSync("Juergen1_data.bin")
  
• Espruino hangs again