There are significant problems with air traffic control and air space capacity all over Europe.
Gatwick is almost at capacity without any ATC strikes, which there are expected to be this summer. Gatwick has a single runway and is ridiculously busy given this, one of the busiest single runway airports in the world. It is where EasyJet operates the most number of flights and EasyJet is the biggest operator there (I think about half the flights at Gatwick are EasyJet flights) so issues at Gatwick were always going to be big problems for EasyJet.
Saying that, there has been widespread disruption and cancellations since travel re-started after Covid. This has been worsened in Europe by the strikes, particularly those in France, by the loss of workforce that occurred during Covid and by the reduction in European airspace due to the war in Ukraine.
Both me and DH fly extensively for work, we have had flight schedule changes or cancellations with all types of airlines most with automatic re-booking onto the next flight - EasyJet, KLM, AerLingus, British Airways, Lufthansa, Wizz Air, all in the last 6 months off the top of my head.
I think the pattern of airlines making these cancellations or schedule changes just ahead of the two week compensation window is becoming more common, from my experience, but I have no real data to support this. I think it is a symptom of the fact the air travel systems in Europe are not coping with the current level of demand. I’m not sure we can expect that to improve in the short term.