Why xterm would run only once on XQuartz?

I have XQuartz running and I can open xterm if I have started XQuartz just for the first time after rebooting the machine. However, as time passes, I cannot create new xterms. So much so that if I quit current XQuartz and restart just XQuartz, I cannot get any xterm. It is annoying that I have to reboot the machine just to be able to use xterm. I am running OS X 10.11 El Capitan. I'll appreciate any insight. Here is the information from pkgutil. $ pkgutil --file-info /Applications/Utilities/XQuartz.app volume: / path: /Applications/Utilities/XQuartz.app pkgid: org.macosforge.xquartz.pkg pkg-version: 2.7.86 install-time: 1445273913 uid: 0 gid: 0 mode: 755