The BBC have been known to screw up the series link on radio programmes. I’ve also seen people reporting problems with BBC TV series.
I’ve had problems with various comedy programmes on Radio 4 Extra. This is the BBCs fault, not yours and not the Humaxes. Reset and reformatting will not help. Looks like you will need to keep your eye on the schedule list, and if your series link appears not to be working try to set the schedule again. You may even need to cancel the existing one first.