Z-wave Entities (Homeseer dimmers) disappear from hassio 0.86.3, still show up in OZW log

I have 5 homeseer WD100+ dimmers setup with an Aeotec Z-wave stick on a NUC install of hassio 0.86.3.

The WD100+'s are running latest firmware.

My issue is that once in a while one or more of them will simple disappear from hassio BUT they are still showing up as before in OZW log.

This has been an issue for a while, so not sure exactly when it started happening. Excluding and re-adding doesnt work, I have to exclude, reset the dimmer, then re-add for them to re-appear with a new node id - and after a while they may disappear again.

Below is an example of a dimmer showing up in OZW log but no longer shows in the zwave panel in HA (there is no longer a node060 but used to be).

I dont know what triggers this, but seem to notice more after a HA restart.

 2019-01-31 00:35:42.237 Detail, Node060,   Received: 0x01, 0x19, 0x00, 0x49, 0x84, 0x3c, 0x13, 0x04, 0x11, 0x01, 0x5e, 0x86, 0x72, 0x5a, 0x85, 0x59, 0x73, 0x26, 0x27, 0x70, 0x2c, 0x2b, 0x5b, 0x7a, 0xef, 0x5b, 0xac
2019-01-31 00:35:42.237 Detail, 
2019-01-31 00:35:42.237 Info, Node060, UPDATE_STATE_NODE_INFO_RECEIVED from node 60
2019-01-31 00:35:42.237 Detail, Node060, AdvanceQueries queryPending=0 queryRetries=0 queryStage=Dynamic live=1
2019-01-31 00:35:42.237 Detail, Node060, QueryStage_Dynamic
2019-01-31 00:35:42.237 Detail, Node060, Queuing (Send) SwitchMultilevelCmd_Get (Node=60): 0x01, 0x09, 0x00, 0x13, 0x3c, 0x02, 0x26, 0x02, 0x25, 0x64, 0xbe
2019-01-31 00:35:42.237 Detail, Node060, Queuing (Query) Query Stage Complete (Dynamic)
2019-01-31 00:35:42.238 Detail, 
2019-01-31 00:35:42.238 Info, Node060, Sending (Send) message (Callback ID=0x64, Expected Reply=0x04) - SwitchMultilevelCmd_Get (Node=60): 0x01, 0x09, 0x00, 0x13, 0x3c, 0x02, 0x26, 0x02, 0x25, 0x64, 0xbe
2019-01-31 00:35:42.239 Detail, Unsolicited message received while waiting for ACK.
2019-01-31 00:35:42.250 Detail, Node060,   Received: 0x01, 0x0b, 0x00, 0x04, 0x00, 0x3c, 0x05, 0x5b, 0x03, 0x02, 0x00, 0x01, 0x92
2019-01-31 00:35:42.250 Detail, 
2019-01-31 00:35:42.250 Info, Node060, Response RTT 12 Average Response RTT 12
2019-01-31 00:35:42.250 Info, Node060, ApplicationCommandHandler - Unhandled Command Class 0x5b
2019-01-31 00:35:42.253 Detail, Node060, CAN received...triggering resend
2019-01-31 00:35:42.253 Detail, 
2019-01-31 00:35:42.254 Info, Node060, Sending (Send) message (Attempt 2, Callback ID=0x65, Expected Reply=0x04) - SwitchMultilevelCmd_Get (Node=60): 0x01, 0x09, 0x00, 0x13, 0x3c, 0x02, 0x26, 0x02, 0x25, 0x65, 0xbf
2019-01-31 00:35:42.267 Detail, Node060,   Received: 0x01, 0x04, 0x01, 0x13, 0x01, 0xe8
2019-01-31 00:35:42.267 Detail, Node060,   ZW_SEND_DATA delivered to Z-Wave stack
2019-01-31 00:35:42.286 Detail, Node060,   Received: 0x01, 0x07, 0x00, 0x13, 0x65, 0x00, 0x00, 0x02, 0x8c
2019-01-31 00:35:42.286 Detail, Node060,   ZW_SEND_DATA Request with callback ID 0x65 received (expected 0x65)
2019-01-31 00:35:42.286 Info, Node060, Request RTT 32 Average Request RTT 32
2019-01-31 00:35:42.287 Detail,   Expected callbackId was received
2019-01-31 00:35:42.294 Detail, Node060,   Received: 0x01, 0x09, 0x00, 0x04, 0x00, 0x3c, 0x03, 0x26, 0x03, 0x03, 0xeb
2019-01-31 00:35:42.295 Detail, 
2019-01-31 00:35:42.295 Info, Node060, Response RTT 40 Average Response RTT 26
2019-01-31 00:35:42.295 Info, Node060, Received SwitchMultiLevel report: level=3
2019-01-31 00:35:42.295 Detail, Node060, Initial read of value
2019-01-31 00:35:42.295 Detail, Node060,   Expected reply and command class was received
2019-01-31 00:35:42.295 Detail, Node060,   Message transaction complete
2019-01-31 00:35:42.295 Detail, 
2019-01-31 00:35:42.295 Detail, Node060, Removing current message
2019-01-31 00:35:42.295 Detail, Node060, Notification: ValueChanged
2019-01-31 00:35:42.296 Detail, Node060, Query Stage Complete (Dynamic)
2019-01-31 00:35:42.296 Detail, Node060, AdvanceQueries queryPending=0 queryRetries=0 queryStage=Configuration live=1
2019-01-31 00:35:42.297 Detail, Node060, QueryStage_Configurati

Out of ideas - any help much appreciated!