I had the same issue during the last couple of nights (using EFW2 icw ATIK383L+), used filter delay of 5 secs. I’m using SGP version 2.5.0.23.
It is strange that it happened in the middle of sequence of shooting 10 red frames (so why did it try to change the filter???)
What is most annoying: it does not abort the filter change attempt and to start the recover mode… it just hangs and wastes another scarce Dutch clear night…
I’ve now increased the delay time to 10 sec. and will try again tonight…