The problem is investigated.

The temporary solutions are:
1) remove files that cause problems from cache
2) add caching exceptions to the configuration file /var/cache/nginx/cs/.cs/cs.conf

Example:
exe_trailing:
is_enabled: yes
online:
collector: "default"
loading:
algorithm: "general"
required_weight: 7
urls:
matching:
- sources:
- '\.exe$'
loadable_rejecting:
- "pokerstars.com" # ban all urls which contains pokerstars.com

3) restart ccu

ccu stop --conf /var/cache/nginx/cs/.cs/cs.conf

ps -ef|grep ccu
Check that all processes were terminated

ccu online --conf /var/cache/nginx/cs/.cs/cs.conf --daemon