[Решено] 3 problems: 404 error, Automatic translation always at 0% and some items not translating

Background of the issue:
I activated the automatic translation feature, but this week I notice that all product categories pages load error 404, instead of loading the category. I resaved the permalinks, but without results. I've also set
/** Memory Limit */
define('WP_MEMORY_LIMIT', '256M');
define( 'WP_MAX_MEMORY_LIMIT', '256M' );
And I still get 404.

Also, in the header of WP admin, I get a message:
Translate Everything Automatically 0 / 1
0%, less than 1 min remaining
It is that way for days without change.

And last - I have some custom content in products, a third description, that doesn't get translated automatically.

Symptoms:

Questions: