Hello community,

We have two M1000E chassis in single site with two MXL-10/40GbE in each chassis.
In both chassis switches were configured in stack ring topology.

Also we have PRTG monitoring tool.

One day we updated both MXL stacks up to 9.14(1.3) version.
Since this happened we began receiving SNMP alerts from one of the MXL stack. It occurs once per day and its very short. I mean whole chassis is available and we don't have any issues with production traffic flows.
We get alerts which looks like SNMP not responding. Only from one chassis. Another chassis(MXL switches) is ok.
Single difference what i found - different versions before update. Problem switches were 9.7 version opposite chassis without SNMP issue - 9.5.
I couldn't find any messages in syslog in time when happening issue with snmp.

Chassis without problem:

#sho os-version

RELEASE IMAGE INFORMATION :
---------------------------------------------------------------------
      Platform          Version        Size           ReleaseTime
  IOM-Series:XL        9.14(1.3)    48231018    Mar 20 2019 03:15:44

TARGET IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
       runtime        9.14(1.3)        Control Processor      passed

BOOT IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
    boot flash          4.0.1.3        Control Processor      passed

BOOTSEL IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
 boot selector          4.0.0.2        Control Processor      passed

CPLD IMAGE INFORMATION :
---------------------------------------------------------------------
         Card                      CPLD Name    Version
 Stack-unit 0                IOM SYSTEM CPLD          6
 Stack-unit 1                IOM SYSTEM CPLD          6
#exit

Chassis which responds with SNMP issue:

#sho os-version

RELEASE IMAGE INFORMATION :
---------------------------------------------------------------------
      Platform          Version        Size           ReleaseTime
  IOM-Series:XL        9.14(1.6)    48299890    Jul 17 2019 10:43:32

TARGET IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
       runtime        9.14(1.6)        Control Processor      passed

BOOT IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
    boot flash          4.0.1.3        Control Processor      passed

BOOTSEL IMAGE INFORMATION :
---------------------------------------------------------------------
          Type          Version                   Target    checksum
 boot selector          4.0.0.2        Control Processor      passed

CPLD IMAGE INFORMATION :
---------------------------------------------------------------------
         Card                      CPLD Name    Version
 Stack-unit 0                IOM SYSTEM CPLD          6
 Stack-unit 1                IOM SYSTEM CPLD          6
#exit

So maybe anybody have ideas how we can debug this issue?

Thank you in advance!