Brocade ICX6610 crashing while pooled

Hello guys, 

I'm facing an issue with monitoring Brocade stack. I can successfully add brocade to Observium, discovery runs without any issue, but when pooler starts reading info from device, Brocade just crash and reboot itselves. 

Brocade stack contains 5 units:

3x ICX6610-24

2x ICX6610-48

Stack is running on firmware 08.0.30mT7f3. 

I'm connecting over SNMP v2c, UDP, port 161. 

Do you know what can cause this issue ?

Thank you !!