Trends issue WinCC7.4

[colorprint2008]

Dear Gents,
I faced with trends issue.
I adjust logging as:
- 6 days period of all segments
- 2 days period of one segments

I notice that 2 day trends are working right, but after 2 days WinCC is losing data from archive.

If I create onlinetable and put archive tag to the table. And I noticed that there no data after 2 days.
But if I restart Runtime, I can monitor archieve per 6 days.
And after 2 days issue repeats.

Here is screens: https://yadi.sk/d/M8nJYHO5Pvy2Jw

Thanks in advance