Thank you!
This was the solution:
max_allowed_packet=32M ----> change/add in MySQL service.
No more problems with Moodle - latest version: 3.5.2, I mean error writting to database or reading from database.
Best regards!
General help
Problem with Moodle 3.5.2 - latest version
Оваа дискусија е заклучена, и повеќе неможе да се пишуваат одговори.