Inaccurate RTC on RouterBOARD 3011UiAS

My RouterBOARD 3011UiAS
s.n. 689A05F53506

Lost ~1,5 seconds each 1 minute!!!

The time and date are always bad, also using SNTP or NTP client do not still syncronized,
i cant’ use any time-based service with this problem

Factory / Current Firmware 3.27
RouterOS 6.34.2

sorry, wrong section:

http://forum.mikrotik.com/viewtopic.php?f=3&t=105852