All my servers with 78.0.16 lost sessions (PHP)

Hi. I've a problema on all my servers, with 78.0.16. Too many tickets of my customer speak about lost sessions in theirs webs. Also, my own server with my support ticket system, (WHMCS) get same problem. At now, all web with fails uses, PHP-FMP, and any uses file for sessions and others mysql (mariadb on my server) Any ideas?