Replace .htaccess file:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^wp-admin/ – [L]
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^page/?([0-9]{1,})/?$ /index.php?&paged=$1 [QSA,L]
RewriteRule ^(.+)/page/?([0-9]{1,})/?$ /index.php?page_id=$1&paged=$2 [QSA,L]
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
No guarantee
