Zebra zt410 SNMP agent fails every 2 days


We have a bunch of zebra zt410 (ZTC ZT410-203dpi ZPL)

we are querying them every 30s by SNMP for monitoring purposes.

every 2-3 days SNMP daemon fails without any reason and only restart of the printer helps - at the same time all other functions works as expected.

Can someone advice what cant be checked to determine the reason of this behaviour?