spontaneous closing of applications

[Heeringa, W.J.]

Hello all,

I'm using Lubuntu 14.10. But when using it for an hour or so, suddenly
applications are closed. Subsequently all icons disappear. It is no longer
possible to start any application. I try to logout but get a message:

Execution of daughter process lxsession-default has failed (File or folder
does not exist).

This has happened now several times, I can work for about an hour and then
need to turn off the computer, turn it on and reboot.

I'm running from an external hard disk (Seagate). What can be the cause of
this problem? Is something wrong with the installation of Lubuntu, or is
something wrong with the external hard disk?

Wilbert
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