Windows 2.5.0 client causes 100% load on my server

Ubuntu Server 18.10
nginx 1.15.5
php-fpm 7.2.10
mysql 5.7.24
Nextcloud: 14.0.3

The second i launch Windows 2.5.0 client my server`s CPU load goes to 100% and it stays this way even without any syncing. If i pause syncing in client nothing happens, only after client is closed everything goes back to normal. No errors in nextcloud log.
With 2.3.3 client everything looks fine.

Yes, thank you. I enabled Activity app for now and it solved the problem.