Just popping in to let you know that we’re still looking in this.
There are a few theories as to what is actually causing this (one involved particular OS versions, hence asking for that earlier) and it is actually quite possible that there may be more than one factor that plays a role - or that there are multiple different issues that just happen to look very similar in terms of symptoms.
We’ll let y’all know once we have a clear answer - until then, please do hang in there, and let us know of anything that stands out in the way this happens.