I get plenty of these, can this be verified if this is an issue?

https://www.xxxx/discover/?csrfKey=d48191b7e277c1ece8e1fab73737c700&view=condensed

TypeError: flock(): Argument #1 ($stream) must be of type resource, bool given in /srv/www/public_html/system/Theme/Cache/Template.php:90

Stack trace:

#0 /srv/www/public_html/system/Theme/Cache/Template.php(90): flock()

#1 /srv/www/public_html/system/Theme/Theme.php(802): IPS\Theme\Cache\_Template->exists()

#2 /srv/www/public_html/system/Theme/Theme.php(885) : eval()'d code(7611): IPS\_Theme->getTemplate()

#3 /srv/www/public_html/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_core_front_global->globalTemplate()

#4 /srv/www/public_html/system/Dispatcher/Dispatcher.php(173): IPS\Theme\_SandboxedTemplate->__call()

#5 /srv/www/public_html/system/Dispatcher/Standard.php(113): IPS\_Dispatcher->finish()

#6 /srv/www/public_html/system/Dispatcher/Front.php(598): IPS\Dispatcher\_Standard->finish()

#7 /srv/www/public_html/system/Dispatcher/Dispatcher.php(155): IPS\Dispatcher\_Front->finish()

#8 /srv/www/public_html/index.php(13): IPS\_Dispatcher->run()

#9 {main}

Edited March 10Mar 10 by PatrickRQ

I would advise first of all upgrading to the latest release of the platform, and then seeing if that continues