Cycles extending longer than anticipated seems common, and that would include versions where the attacks are milder and fewer/farther between in the extended weeks.
There has also been a minor flurry of reports as of late of CH'ers ending a cycle, only to have it then start right back up again for them. Weird that that one has struck a cluster of clusterheads all in a row, but as I more carefully read your report, it sounds like this fortunately will not be the case for you.