Same issue reported by many others, however its consistency has made the experience of using FlockMOD more difficult to enjoy.
Sometimes the room list will not load, along with a message saying, "disconnected".
Sometimes the room list WILL load, but I am not able to join a selection of public rooms.
Sometimes within the room, either myself or everyone gets disconnected while a number of us are reconnected.
On a side note, when using text within a room goes out of wack (either by uncontrollably changing the zoom or not being able to place a text onto the room canvas) it really interferes with you drawing.
Also, opening and using a separate internet tab freezes FlockMOD (its own tab) and you'll have to refresh the page.
Using the desktop version or removing cache does not help the issue apparently. Just thought I gave feedback on an issue that's quite troubling and happening for me at the moment.