My farming/harvesting seems broken

[BertBril]

I've been farming since August 2021. During that period I've had some setbacks like hardware problems, but everything was solved by the end of 2022, and I've harvested nicely in line with the 'estimated time to win'. But by around March of this year I haven't harvested anything anymore. I know we are talking probabilities here, but it's getting strange. This graph says it all:

I'm wondering whether I've missed some change in setup, it looks very much like I'm no longer harvesting. All the outputs like 'chia farm summary' look just like before but for some reason nothing comes in.

My question is therefore: how can I figure out whether something is wrong, and if so, what?