It doesn't look like routine maintenance and therefore it's a "problem with the airframe or something". Really though?
To be fair, you need some evidence to back this up. Jet2 seems to have taken a battering in the last few weeks. Thomas Cook had a lot more tech delay last summer and didn't see anyone branding their aircrafts unsafe or criticising maintenance practises. I think people are being a bit unfair. I think they've been quite unlucky recently. But least they sort their tech delays, generally, a lot quicker than others.