which litespeed version are you running ?
1. to be sure it's the latest version and build
if it's 5.3, please do
#/usr/local/lsws/admin/misc/lsup.sh -f -v 5.3
2. if 1) still don't resolve the issue, please do
#rm -rf "/tmp/lshttpd/swap/*"
3. if still issue, please report here