Inconsistent results - sometimes none?

[lyricnz]

Running
smrt stats -i en12 -l debug --switch-mac b4:b0:24:3a:f1:3b --username admin --password removed

Sometimes it works, sometimes no results are returned. Examples of each below

DEBUG:network:Sending Packet: 0101b4b0243af13b4865ee186f5a00d6000000000028000000000f5e0000000040000000ffff0000
DEBUG:network:Sending Header:  {'version': 1, 'op_code': 1, 'switch_mac': b'\xb4\xb0$:\xf1;', 'host_mac': b'He\xee\x18oZ', 'sequence_id': 214, 'error_code': 0, 'check_length': 40, 'fragment_offset': 0, 'flag': 0, 'token_id': 3934, 'checksum': 0}
DEBUG:network:Sending Payload: [(16384, b'')]

DEBUG:network:Receive Packet: 0104b4b0243af13b4865ee186f5a00d5000000000024000000000f5e00000000ffff0000
DEBUG:network:Received Header:  {'version': 1, 'op_code': 4, 'switch_mac': b'\xb4\xb0$:\xf1;', 'host_mac': b'He\xee\x18oZ', 'sequence_id': 213, 'error_code': 0, 'check_length': 36, 'fragment_offset': 0, 'flag': 0, 'token_id': 3934, 'checksum': 0}
DEBUG:network:Received Payload: []

===

DEBUG:network:Sending Packet: 0101b4b0243af13b4865ee186f5a031f000000000028000000004b180000000040000000ffff0000
DEBUG:network:Sending Header:  {'version': 1, 'op_code': 1, 'switch_mac': b'\xb4\xb0$:\xf1;', 'host_mac': b'He\xee\x18oZ', 'sequence_id': 799, 'error_code': 0, 'check_length': 40, 'fragment_offset': 0, 'flag': 0, 'token_id': 19224, 'checksum': 0}
DEBUG:network:Sending Payload: [(16384, b'')]
DEBUG:network:Receive Packet: 0102b4b0243af13b4865ee186f5a031f000000000097000000004b18000000004000001301010509ca533800000000181f828c000000004000001302010000e2f7a300000000008b4f390000000040000013030100001060fc0000000000004cd400000000400000130401060137af3d0000000000b2b8d8000000004000001305010618d604d5000000000accd9a400000001ffff0000
DEBUG:network:Received Header:  {'version': 1, 'op_code': 2, 'switch_mac': b'\xb4\xb0$:\xf1;', 'host_mac': b'He\xee\x18oZ', 'sequence_id': 799, 'error_code': 0, 'check_length': 151, 'fragment_offset': 0, 'flag': 0, 'token_id': 19224, 'checksum': 0}
DEBUG:network:Received Payload: [(16384, 'stats', (1, 1, 5, 164254520, 0, 404718220, 0)), (16384, 'stats', (2, 1, 0, 14874531, 0, 9129785, 0)), (16384, 'stats', (3, 1, 0, 1073404, 0, 19668, 0)), (16384, 'stats', (4, 1, 6, 20426557, 0, 11712728, 0)), (16384, 'stats', (5, 1, 6, 416679125, 0, 181197220, 1))]
(16384, 'stats', (1, 1, 5, 164254520, 0, 404718220, 0))
(16384, 'stats', (2, 1, 0, 14874531, 0, 9129785, 0))
(16384, 'stats', (3, 1, 0, 1073404, 0, 19668, 0))
(16384, 'stats', (4, 1, 6, 20426557, 0, 11712728, 0))
(16384, 'stats', (5, 1, 6, 416679125, 0, 181197220, 1))