This issue is related to the SNMP agent on Proxim AP 2000 devices. This happens when AMP polls the AP using the SNMP GETBULK request used for fetching multiple OIDs within the same SNMP GET request packet.
Workaround: Switch to SNMP v1
Because SNMP v1 doesn't support SNMP GETBULK, by switching to SNMP v1 you can avoid this issue.
In the AMP GUI go to the Groups > Basic page and select SNMP v1 under the Proxim section. This change needs to be made to all groups containing Proxim AP 2000s.
Proxim has discontinued support for the AP 2000.