OPC DA connection Fails eventually

Hi All,
We have established OPC DA connection with Archestra Gateway. it establishes connections and we are able to read tags from the gateway but after sometimes we loss tag update on Ignition. When we restart connection it starts refreshing again values/tags. When we try to browse tags in OPC quick client, it shows warning in log as below:

Anyone faced similar issue or any thoughts on it, please share. Thanks in advance.