Stephen - K6SJT
(1) I cleared the B4 cache.
(2) I have not observed the condition repeat over the weekend.
(3) FT4 has been very slow during this period, so if the issue is exacerbated by a high volume of calls (as mentioned in this blog) then that may be why I haven't observed it?
I'll keep watching and report any details of importance - Thank you,
Stephen Taylor - K6SJT