Being that this is happening on both machines, then it just could be such things as low or dirty power. Cold also be linked to your common internet connection.
I have been running FTM on many machines (at this time 5 machines)and have never had it do the closing of the program.
You did NOT state what AV and other protection programs are running on these machines?
This "closed unexpectedly " can be because of some system and/or hardware problems.
Are your ".Net" files all up to date?
They will be found in the "Windows Update" to be checked.