L2A_GIPP.xml get corrupted during processing

Sometimes during processing, my L2A_GIPP.xml file gets wiped and then contains only one line:

<?xml version="1.0" encoding="UTF-8"?>

this of course leads then to errors in subsequent processings of differnt images:

Sentinel-2 Level 2A Prototype Processor (Sen2Cor), 2.2.1, created: 2016.04.29 started …
Traceback (most recent call last):
File “/opt/CONDA/V2/bin/L2A_Process”, line 9, in
load_entry_point(‘sen2cor==2.2.1’, ‘console_scripts’, ‘L2A_Process’)()
File “/opt/CONDA/V2/lib/python2.7/site-packages/sen2cor-2.2.1-py2.7.egg/sen2cor/L2A_Process.py”, line 221, in main
result = config.readPreferences()
File “/opt/CONDA/V2/lib/python2.7/site-packages/sen2cor-2.2.1-py2.7.egg/sen2cor/L2A_Config.py”, line 3257, in readPreferences
xp=L2A_XmlParser(self,‘SC_GIPP’)
File “/opt/CONDA/V2/lib/python2.7/site-packages/sen2cor-2.2.1-py2.7.egg/sen2cor/L2A_XmlParser.py”, line 21, in init
doc = objectify.parse(config.configFn)
File “src/lxml/lxml.objectify.pyx”, line 1835, in lxml.objectify.parse (src/lxml/lxml.objectify.c:25521)
File “src/lxml/lxml.etree.pyx”, line 3427, in lxml.etree.parse (src/lxml/lxml.etree.c:79801)
File “src/lxml/parser.pxi”, line 1782, in lxml.etree._parseDocument (src/lxml/lxml.etree.c:115995)
File “src/lxml/parser.pxi”, line 1808, in lxml.etree._parseDocumentFromURL (src/lxml/lxml.etree.c:116345)
File “src/lxml/parser.pxi”, line 1712, in lxml.etree._parseDocFromFile (src/lxml/lxml.etree.c:115233)
File “src/lxml/parser.pxi”, line 1115, in lxml.etree._BaseParser._parseDocFromFile (src/lxml/lxml.etree.c:109930)
File “src/lxml/parser.pxi”, line 573, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:103404)
File “src/lxml/parser.pxi”, line 683, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:105058)
File “src/lxml/parser.pxi”, line 613, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:103967)
lxml.etree.XMLSyntaxError: Start tag expected, ‘<’ not found, line 2, column 1

Has anybody else had this problem? I am running sen2cor on a CENTOS 7 VM.