This only affects WP's. DWP's, JWP's and CP's are not affected.
Investigation
Within the log file for the WP's you can see memory being allocated with messages similar to these:
U00003409 'INPUT'-memory successfully allocated (Adresse = '0x81dd8b10', Länge = '68608/67k').
U00003409 'INPUT'- memory successfully allocated (Adresse = '0x81d62d60', Länge = '69632/68k').
U00003409 'INPUT'- memory successfully allocated (Adresse = '0x81e40e40', Länge = '70656/69k').
U00003409 'INPUT'- memory successfully allocated (Adresse = '0x81dd7f30', Länge = '71680/70k')
Every minute more memory is allocated.
This happens until no memory is available on the machine, and the system fails.
This does not occur necessarily on every system, but we have seen this on a Linux system running the Automation Engine.