Sometimes external applications etc. cannot accept data as fast as th
macro can send it, so something has to give - usually the macro.

This looks like your problem. A way of getting round this is to pu
delays in the programme to allow for this. eg. 10 seconds ..
Application.Wait Now + TimeValue("00:00:10")

I suggest you dalso try an 'On Error Goto' line to exit more gracefull
while you are tweaking this to see what is suitable. I did do one som
time ago for a printer that included a wait line and included anothe
On Error line to keep trying/waiting. Can't find it though

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