problem with group actions "ERROR_RESOURCE_GONE"

it looks like the problem comes when sonos rooms are added or removed (over API) to a group..but the group id is always the same. after an undefined time (it can only be a few seconds) is the problem away and I can control it...

here an example;
curl -H "Content-Type: application/json" -H "Authorization: Bearer TOKEN" "https://api.ws.sonos.com/control/api/v1/households/HOUSEHOLDS/groups" | jq '.groups[]'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1582 100 1582 0 0 5568 0 --:--:-- --:--:-- --:--:-- 5570
{
"id": "RINCON_5CAAFDEECFC001400:2737969811",
"name": "Entree + 3",
"coordinatorId": "RINCON_5CAAFDEECFC001400",
"playbackState": "PLAYBACK_STATE_PLAYING",
"playerIds": [
"RINCON_5CAAFDEECFA001400",
"RINCON_5CAAFDEECFB801400",
"RINCON_5CAAFDEECFC001400",
"RINCON_5CAAFDEED07A01400"
]
}

and the command;
curl -H "Content-Type: application/json" -H "Authorization: Bearer TOKEN" "https://api.ws.sonos.com/control/api/v1/groups/RINCON_5CAAFDEECFC001400:2737969811/favorites" -d '{"favoriteId":22, "playOnCompletion":true, "playModes": {"shuffle": false } }'

output is;
{"errorCode":"ERROR_RESOURCE_GONE"}

after a few seconds exactly the same command output is;
{}

and its OK.

many thanks,
marco

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