Can you post the exact issue you're seeing in the #help channel on discord? We've been looking at improvements to the macOS version this past week but with a lack of a suitable environment to test changes we're finding it hard to identify the cause.
Have done - what client where you using, RuneLite or vanilla? Only reason it should be checking the coffer is if you haven't had to enter your bank PIN yet, so did it happen after relog?
We made a pretty big change to the comms layer yesterday which is causing some issues - we're working to get these issues resolved, hopefully have everything fixed in the next few hours :)
It's a mixture of things, but we can only speculate as to what they watch on the server-side. The client itself has been reversed every which way, so we know what raw data the collect, just not how they use it.