MSA 2040 SNMP uptime

[i-o-o-i]

Hello,

from console, show controller-statistics both I see Power On Time several months (in seconds of course). 

But from SNMP OID 1.3.6.1.2.1.1.3.0 I get uptime of only few days.

I don't see anything in logs and I am not aware of storage restart. Did someone experience this? The OID should be standard for system uptime. What else could have been restarted but controllers on MSA?

Thanks for any idea.