Several times a day, my Notes client will appear busy (lightning bolt and hourglass appear) for more than a minute. During this time, the workspace cannot be accessed. Towards the end of this process, Notes displays "Connecting to..." and then "Connected to..." just before Workspace access is again allowed. I can sometimes mimic this issue by selecting multiple databases, and choosing Mark Selected Read. Oddly enough though, selecting Ctrl+Break will cease the busy activity, while also properly marking the databases as Read.
The issue only seems to occur on (2) HP laptops (one with a R6.5.4 client, and one with R6.5.5).