PHP memory exhausted admin interface

Hi :)

Sometimes the administration interface gives me blank pages (mostly when trying to save settings) and I noticed the PHP memory is exhausted by the admin script sometimes. This is visible in the error log, e.g.:
2015-01-07 21:09:51.564 [NOTICE] [xx.xx.xx.xx:49466] [STDERR] PHP Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 87 bytes) in /opt/litespeed/admin/ on line 297
For now I solved it by upping the memory_limit in <openlitespeed dir>/admin/conf/php.ini to 16M.