we experience a strange behaviour with our XWiki 10.1+1 installation on Ubuntu 16.04 with Tomcat 8.0.32-1ubuntu1.5, Mysql 5.7.21 and Java 1.8.0_161. After ~1 minute permanent use, XWiki gets more and more slowly until the whole Tomcat freezes and we need to restart the Tomcat service. When nobody used XWiki for a day, Tomcat and XWiki still running the next morning. In the logs of Tomcat and Mysql we didn´t find any relatet infos, even when we set a higher information level in the XWiki administration page. Tomcat, the Ubuntu system and the java environement have enough memory space left and the processor isn´t fully occupied.
Maybe someone has an idea how to investigate our problem.
Thanks in advance