UnresolvedSandboxie Multiclienting - Unreliable connection

Although it was working briefly, now whenever I try to multi-client using Sandboxie, the game errors saying that everyone in the queue has an "unreliable connection". The multiclient works up to three clients before it begins to no longer work.

Does anyone know of a solution to this?

Multiple people are having issues with sandboxie currently, don't think anyone has identified the issue yet. Apparently idlers are also having some issues.